CIEAT 2026: Preparation Tips. 2026 information reviewed on 25 September; retain the stated verification limits.
Mathematics: sets, functions and restrictions
A function requires a clear domain and a rule that assigns one output to each permitted input. For a real-valued expression involving the square root of x minus 4, the domain begins at x equal to 4. For a denominator x minus 4, that same value must be excluded. Similar-looking expressions can therefore have different restrictions.
Suppose f of x is x squared and g of x is x plus 3. Then f of g of x is the square of x plus 3, while g of f of x is x squared plus 3. The results differ because composition order matters. Writing the inner operation first prevents accidental multiplication of the two functions.
An inverse function reverses an assignment only when the relevant one-to-one condition is satisfied on the chosen domain. The square function over all real numbers is not one-to-one because opposite inputs have the same square. Restricting the domain to nonnegative inputs changes the situation. Domain information is part of the mathematical problem, not a decorative note.
For set counting, draw the overlap before adding totals. If eighteen students study one topic, fourteen study another and six study both, the number studying at least one is twenty-six. Adding eighteen and fourteen counts the overlap twice. The phrase at least one differs from exactly one, which would require excluding the shared group from the final count.
Mathematics: equations and inequalities
Solving an equation means finding values that satisfy the original statement. Operations used during solving can change the candidate set. Squaring can introduce extra values, and dividing by an expression can remove a case in which that expression is zero. Check the original equation before accepting every algebraic candidate.
For the equation the square root of x plus 6 equals x, the right-hand side requires x to be nonnegative. Squaring gives x squared minus x minus 6 equal to zero, with algebraic candidates 3 and minus 2. Only 3 satisfies the original domain and equation. The negative candidate is an artefact of squaring.
When multiplying or dividing an inequality by a negative quantity, reverse the inequality sign. If the sign of an expression is unknown, separate cases or use a sign chart. Treating an expression containing a variable as if it were definitely positive can invalidate an otherwise neat solution.
For a rational inequality, mark both numerator zeros and denominator zeros on the number line. Test intervals and exclude denominator zeros even if a factor cancels algebraically. A correct sign pattern with an incorrectly included forbidden endpoint is still an incorrect solution set.
Mathematics: progressions and binomial reasoning
Arithmetic progressions use a constant difference, while geometric progressions use a constant ratio. For terms 5, 9, 13 and 17, the fifth term is 21. For terms 5, 10, 20 and 40, it is 80. Looking only at increasing size does not distinguish the underlying rule.
In an arithmetic progression with first term 7 and common difference 4, the tenth term is 43. The sum of the first ten terms is half of ten multiplied by the sum of the first and tenth terms, giving 250. A question asking for a sum should not be answered with the last term.
The binomial expansion separates coefficients from powers. In the expansion of the cube of a plus b, the middle terms contain coefficients of three. These arise from the number of ways the factors can contribute the chosen terms. Understanding that counting link makes it easier to identify a requested term in a larger expansion.
Check the total of binomial coefficients by setting the variable values appropriately. For the expansion of one plus x to the power n, setting x to one gives a coefficient sum of two to the power n. This does not solve every term question, but it is a quick independent check when a small expansion has been written out.
Mathematics: trigonometry and geometry
Trigonometric identities should be used with attention to where expressions are defined. Replacing a ratio with tangent may hide points where the original denominator vanishes. A simplified expression and an original expression can agree on their common domain without having identical domains.
For a right triangle with perpendicular sides of lengths five and twelve, the hypotenuse is thirteen. The sine of the angle opposite the side of length five is five thirteenths. Drawing the angle prevents confusion between opposite and adjacent sides. A familiar numerical triple does not remove the need to identify the requested angle.
In coordinate geometry, the equation of a circle can be interpreted by completing squares. An expression such as x squared plus y squared minus 6x plus 4y minus 12 equal to zero becomes the square of x minus 3 plus the square of y plus 2 equal to 25. The centre is therefore 3, minus 2 and the radius is five.
A line-circle intersection can produce two points, one point or no real point. The discriminant of the resulting quadratic connects the algebra to the geometry. If a diagram suggests a tangent, the algebra should yield a repeated root under exact data. This connection helps detect a sign error before the final answer is selected.
Mathematics: differentiation and integration
Differentiate the structure of an expression before expanding unnecessarily. For the square of 3x plus 1, the chain rule gives 6 times 3x plus 1. Expansion gives the same derivative, but the structural method is shorter. Both methods provide a useful cross-check during early practice.
A zero derivative identifies a stationary point, not automatically a maximum. For x cubed, the derivative vanishes at zero, yet the function continues increasing through that point. For a maximum or minimum question, examine the appropriate sign change or second-derivative information and include endpoints when the domain is a closed interval.
Integration can represent signed accumulation. The integral of x from minus one to one is zero because the negative and positive contributions cancel. The geometric area between the graph and axis over the same interval is one. Read whether the question asks for the integral or total area.
When an indefinite integral is checked, differentiating the proposed answer should recover the integrand on the relevant domain. This is particularly useful for substitutions and logarithmic expressions. The arbitrary constant matters for the family of antiderivatives, but it disappears during the check because its derivative is zero.
Mathematics: probability and vectors
Probability calculations depend on the experiment being defined. Selecting with replacement differs from selecting without replacement. If a container has four green and six yellow objects, the probability of two green selections without replacement is four tenths multiplied by three ninths, or two fifteenths. Reusing four tenths for the second draw would describe another experiment.
Conditional probability uses a restricted sample space. If it is known that an outcome belongs to a smaller group, the denominator must reflect that group. Draw a table of counts when the wording involves overlapping categories. A table can make the relevant conditioning event more obvious than a formula used without interpretation.
For vectors, calculate components before deciding the resultant magnitude. A displacement of six units east followed by eight north has magnitude ten, while the travelled path length is fourteen. The vector result answers a different question from the total distance travelled.
The dot product of vectors with components 1, 2 and 2, minus 1 is zero. Both vectors are nonzero, so the result indicates perpendicular directions. In three dimensions the same principle uses three component products. Always distinguish the scalar dot product from the vector cross product and from ordinary component-by-component multiplication.
Physics: choosing a model
A Physics problem becomes manageable when the physical model is stated first. Identify the body or system, the forces or energy transfers and the conditions being assumed. A question mentioning a smooth surface removes friction from the stated model; a rough surface requires it to be considered. These words can matter more than the largest number in the question.
For a particle initially at rest with constant acceleration of 4 metres per second squared for three seconds, the final speed is 12 metres per second and the displacement is 18 metres. The average speed during this uniformly accelerated motion is six, giving the same displacement when multiplied by time.
If acceleration is not constant, the familiar constant-acceleration equations may not apply. A graph or a rate relation may be needed. Recognising the limit of a formula is part of knowing it. Memorising equations without their conditions encourages confident use in the wrong situation.
Draw a free-body diagram for connected bodies or inclined planes. Resolve forces along useful axes and keep the sign convention consistent. A normal reaction is perpendicular to the contact surface, not necessarily vertically upward. The diagram should express the actual geometry before equations are written.
Physics: conservation, oscillation and fluids
Conservation laws require a defined system. Momentum conservation applies to an isolated system with negligible net external impulse during the event. It does not mean that each object keeps its own momentum in a collision. Objects exchange momentum internally while the system total remains fixed under the stated conditions.
A spring stores energy proportional to the square of its extension in the ideal linear model. Doubling the extension therefore multiplies stored energy by four. This differs from the force, which doubles. Comparing the dependence of related quantities is a useful way to avoid choosing an option based only on a familiar word such as spring.
For simple harmonic motion, acceleration is directed towards the equilibrium position and is proportional to displacement with the opposite sign. At the equilibrium position, speed is greatest in the ideal undamped motion, while acceleration is zero. At an extreme position, speed is zero and acceleration magnitude is greatest.
In fluids, pressure at a depth depends on density, gravitational acceleration and depth in the simple hydrostatic model. Container width does not directly appear in that relation. A wider vessel can contain more liquid at the same depth without producing a different hydrostatic pressure at an equivalent point solely because of its width.
Physics: electrical and optical checks
A circuit should be read through its connections. Two components sharing the same pair of nodes are in parallel, irrespective of how they are drawn on the page. Redrawing a circuit can reveal a simple structure hidden by a complicated layout. Preserve connections while changing the visual arrangement.
For a 9-volt potential difference across a 3-ohm resistor under Ohmic conditions, current is 3 amperes and power is 27 watts. If two such resistors are placed in series across the same source, the total resistance doubles and the current halves. The source voltage should not be assigned independently to each series resistor.
For a lens, use a consistent sign convention and a rough ray sketch. A real image and a virtual image correspond to different ray behaviour. A negative answer in an equation has meaning only through the convention being used; it is not automatically proof of a mistake.
In wave optics, changing wavelength can alter interference spacing under otherwise fixed conditions. Before applying a proportional relationship, identify what remains constant. A question that changes both wavelength and distance cannot be answered by considering only one of those changes.
Chemistry: quantities and structure
The mole connects a macroscopic amount with a number of chemical entities. Convert mass to moles using the appropriate molar mass before applying a balanced reaction ratio. A coefficient of two means two reacting amounts in the equation's units, not necessarily twice the mass of another substance.
As an original example, a reaction uses one mole of a substance A for two moles of B. If three moles of A and four moles of B are available, B limits the reaction to the amount corresponding to two moles of A. One mole of A remains in the ideal complete-reaction calculation.
Electronic structure should be worked from the correct electron count. A neutral atom and its positive ion have the same number of protons but different numbers of electrons. When comparing size or bonding behaviour, make sure the species being discussed is the actual ion or atom specified.
Bond polarity alone does not determine whether an entire molecule is polar. Geometry can cause bond contributions to cancel. Draw the arrangement and consider the vector combination rather than counting polar bonds. A symmetric arrangement can behave differently from an asymmetric arrangement containing similar bonds.
Chemistry: reactions, equilibrium and organic logic
Reaction rate and equilibrium position answer different questions. A catalyst can help a system approach equilibrium faster without changing the equilibrium constant at a fixed temperature. A process being fast does not establish that the final equilibrium strongly favours products, and a favourable equilibrium does not establish a fast rate.
For a first-order reaction, equal time intervals corresponding to the half-life halve the amount remaining. After three half-lives, one eighth remains. The amount consumed is seven eighths, which is different from the amount remaining. Read the requested quantity before selecting between these complementary values.
Organic reaction preparation benefits from grouping transformations. Connect an alcohol, a carbonyl compound and a carboxylic acid through the relevant oxidation relationships where the substrate and conditions permit. Then practise recognising when a reagent or structural feature prevents the simple sequence from applying.
For isomer counting, keep a systematic record of distinct structures. Reversing a drawing does not necessarily create a new molecule, and symmetry can make two apparent positions equivalent. Naming or numbering each candidate consistently helps remove duplicates before the final count is chosen.
Biology: cells and biological processes
Biology-route preparation should connect structures with functions. A cell diagram is more useful when the student can explain what a labelled component does and how it relates to other components. Memorising a shape without the process can fail when a question presents the same structure in another orientation or context.
Distinguish movement down a concentration gradient from processes requiring additional energy input under the relevant biological mechanism. A membrane's selective properties matter. Do not assume that all substances cross it in the same way simply because they are present on both sides.
Cell division should be studied through chromosome behaviour and the purpose of each division. Track what is being counted: chromosomes, chromatids or DNA amount. These quantities can change differently through a cycle. A diagram showing the stage is often more reliable than a memorised number detached from the stage.
For metabolism, separate the overall purpose of a pathway from its individual steps. Know where a process occurs, what enters, what leaves and how energy is involved. Then use detailed steps to explain that larger picture. Lists of enzyme names without a process map are difficult to retain and apply.
Biology: inheritance, ecology and experimental reasoning
Inheritance questions require a defined cross and assumptions about the trait. A simple dominant-recessive model should not be applied automatically to every inheritance pattern. Write the parental genotypes, identify possible gametes and then combine them. This prevents phenotype descriptions from being mistaken for exact genotypes.
In a simple cross between two heterozygous parents for one autosomal trait under complete dominance, the genotype proportions are one quarter, one half and one quarter. The phenotype proportions differ because two genotypes share the dominant appearance. State which distribution the question asks for before giving a ratio.
Ecology questions often connect populations with resources and interactions. A change in one population can have several possible effects through a food web. Use the relationships provided rather than assuming that every increase or decrease has a single inevitable consequence. The scale and time period of the observation also matter.
For an experiment, identify the independent variable, the measured outcome and the controls. If several conditions change simultaneously, attributing the result to one cause becomes difficult. This reasoning supports interpretation of biological data without requiring the student to memorise a particular experimental result.
Study plans for different starting points
A student already preparing well for board examinations may need more mixed multiple-choice practice than basic rereading. Start with a timed diagnostic to identify where school knowledge is not translating into quick decisions. The weakness may be option interpretation, calculation speed or unfamiliar presentation rather than an unlearned chapter.
A student with gaps should rebuild a smaller number of foundations before increasing mock frequency. For example, revising algebraic manipulation can improve several Mathematics topics, while learning balanced-equation calculations can unlock much of quantitative Chemistry. Progress should be measured by independent solutions to new questions, not by pages read.
A Biology-route student should maintain Physics and Chemistry alongside the larger Biology block. Spending every session on the favourite subject can produce a strong fifty-question component but a weak overall total. Short regular numerical practice is especially useful when calculation has become less familiar during Biology-heavy revision.
For a student managing school and entrance preparation together, use overlapping topics deliberately. After studying a board chapter, solve a short entrance-style set from that chapter and later revisit it in a mixed set. This avoids treating the two preparations as completely separate while still training their different response formats.
An original four-week revision sequence
In the first week, map the paper and attempt a diagnostic across all three relevant subjects. Identify a few prerequisite gaps and repair them with worked examples followed by independent questions. Keep the daily plan achievable enough that completed work can be reviewed rather than rushed and forgotten.
In the second week, increase mixed practice and start recording time. Rotate the order of subjects in practice to discover whether beginning with the strongest subject helps or whether it leads to overspending time. The best order depends on actual performance and the interface's permitted navigation.
In the third week, take full-length simulations and analyse them before starting the next. Group errors into concept, reading, calculation and time-management categories. A repeated mistake should lead to a specific exercise, such as sign-convention practice or a short set on limiting reagents, rather than another broad instruction to study harder.
In the fourth week, concentrate on corrected errors, formula conditions, reaction maps and the practical test arrangement. Avoid changing the entire strategy immediately before the examination. A familiar routine that has worked in several simulations is more dependable than an untested plan adopted because of another student's experience.
