Kumamoto Entrance Science common mistakes
Kumamoto Entrance Science · Understand the traps and how to avoid them.
In mathematics, writing the final answer after solving an equation without checking whether the question asked for a value, a range, a count, or a proof, so a correct computation is recorded in the wrong form (e.g., giving x = 2 when the question asked for the number of integer solutions).
Under time pressure candidates treat the last line of algebra as the answer and stop reading the question stem; Kumamoto-style papers often phrase the demand in a final clause that is easy to skip.
What to do instead
Before writing the answer line, underline the interrogative in the stem (値を求めよ / 個数 / 範囲 / 証明せよ) and restate it in one short phrase above the answer. Train by re-answering past papers with only the final sentence read first, then checking your answer matches the requested object.
In mathematics, dropping or misapplying conditions attached to a problem, such as ignoring that a variable is a positive integer, that a triangle is acute, or that a point lies on a specified arc, and then solving the unconstrained version.
Candidates extract the equations and discard the prose conditions because conditions feel like decoration; this is especially common in probability, trigonometry, and coordinate geometry where a condition silently removes cases.
What to do instead
At the start of each problem, copy every stated condition into a short list on the page (定義域, 正の整数, 鋭角, 0≤θ<2π). After obtaining a candidate answer, run each condition as a filter and cross off any solution it eliminates. Practise by taking solved problems and listing which conditions were actually used.
In physics, substituting numbers into a formula before deciding which physical principle applies, producing equations that mix quantities from different objects or different instants (e.g., using the speed at the top of a loop for the whole motion).
Formula recall is easier than modelling, so candidates pattern-match on keywords like 等加速度 or 力学的エネルギー and skip drawing the situation and naming the system.
What to do instead
Enforce a fixed three-step routine on every mechanics problem: draw the object(s), mark the chosen system boundary and the two states or instants, then write the conservation or Newton equation between those states only. Label subscripts by state (v_1, v_2) so mixing instants becomes visibly wrong.
In physics, reporting a numerical answer with the wrong unit or wrong significant figures, or omitting direction for a vector quantity, after a correct calculation.
The arithmetic absorbs attention, and candidates treat units and direction as presentation rather than part of the answer; Japanese papers frequently award marks for the unit-bearing value.
What to do instead
Carry units through the algebra (write m/s, not just numbers) and convert to SI at the start. Before finalising, check that vector answers state direction or sign convention and that the number of significant figures matches the data given. Do a dimensional check on the final expression.
In chemistry, balancing an equation or writing an ionic equation by adjusting coefficients until atoms match while ignoring charge balance and the actual species present in solution (e.g., writing molecular species in an ionic equation, or leaving a strong acid undissociated).
Atom counting is taught first and charge is treated as a secondary check; candidates also memorise reaction types without tracking which species are strong electrolytes.
What to do instead
Balance in a fixed order: atoms other than O and H, then O, then H, then verify total charge on both sides. For ionic equations, first list strong acids, strong bases, and soluble salts as dissociated ions, then cancel spectators. Keep a one-page table of strong/weak electrolytes and consult it while practising.
In chemistry, describing observations or products from memory of a textbook reaction rather than from the specific reagents and conditions given, such as predicting a precipitate where the combination is soluble, or missing that heating or concentration changes the product.
Candidates revise named reactions as stories and transfer them to superficially similar reagent pairs without checking solubility rules or conditions.
What to do instead
For every inorganic reaction question, explicitly write the two reagents, the condition (加熱, 濃, 希, 触媒), and then apply solubility rules or an activity series before naming products. Build a personal table of exceptions (e.g., salts that are insoluble despite the general rule) and test yourself by mixing random reagent pairs.
In biology, answering a genetics or cell-division question with the expected ratio or chromosome number while ignoring the stage or the parent genotype specified, for example giving the F2 ratio when the cross is a test cross, or counting chromatids as chromosomes at metaphase.
Ratio patterns and chromosome numbers are memorised as isolated facts; candidates do not redraw the cross or the cell cycle stage and so apply the wrong template.
What to do instead
Always draw the cross with parental genotypes written out and label gametes before computing ratios, and specify whether the question asks for phenotype or genotype ratio. For division questions, draw the cell at the named stage with centromeres and chromatids marked, then count. Keep a stage-by-stage table of DNA amount, chromosome number, and chromatid number.
In earth science, treating the geological timescale, rock classification, or atmospheric layers as lists to recall, and then placing an event or rock type in the wrong order or category because the reasoning from evidence (stratigraphy, fossil succession, composition) is skipped.
Basic Earth Science is often revised late and by memorisation, so candidates cannot reconstruct order from the evidence given in an unfamiliar diagram or description.
What to do instead
Practise ordering questions by applying principles explicitly: superposition, cross-cutting relationships, and fossil succession, writing the reasoning next to the order. For rocks, classify by origin first (igneous/sedimentary/metamorphic) and then by texture or composition. Keep a single timeline sheet with eras, major events, and index fossils, and redraw it from memory weekly.
In English, reading a passage and choosing an option that is true in general knowledge or repeats words from the text but does not answer the specific question asked, and in composition, writing sentences that are grammatical but do not address the prompt's exact task.
Word-matching feels safe under time pressure, and candidates answer from the topic rather than from the question type (main idea, detail, inference, author's attitude).
What to do instead
Read the question stem before the options and classify its type, then locate the supporting sentence and underline it before evaluating options. Reject any option you cannot tie to a specific line. For composition, rewrite the prompt as a one-line task (e.g., 'state and support an opinion on X') and check the finished piece against that line.
In Japanese Language, answering a reading comprehension question with a paraphrase that is plausible but not supported by the indicated portion, or writing a composition that states a conclusion without the required example or counter-argument structure.
Candidates rely on overall impression of the passage and on everyday opinion for the composition, neglecting the explicit instruction (傍線部の理由, 筆者の考え, 具体例を挙げて) that defines what earns marks.
What to do instead
For reading, mark the line or paragraph referenced, find the sentence that gives the reason or claim, and build the answer from that sentence's own wording before matching options. For composition, outline in three parts (主張, 根拠となる具体例, 反論への言及) and check the outline against the prompt's instruction words before writing. Time one outline-only drill per session.