ENEM common mistakes
ENEM · Understand the traps and how to avoid them.
On interdisciplinary humanities items, the candidate picks the alternative that matches their personal opinion or a single keyword in the stimulus instead of the interpretation supported by the documents and by the historical/social context presented.
ENEM humanities items usually present a document (text, chart, map, image description) plus a school concept, and the candidate reads only the headline or the first line, then answers from prior beliefs or from a memorable buzzword. The exam rewards contextualized reading, not opinion, and the distractors are built precisely from plausible but decontextualized keywords.
What to do instead
Before looking at the alternatives, write one sentence summarizing what the stimulus says and which concept it illustrates (e.g., 'this text shows how industrialization changed labor relations'). Then test each alternative against that sentence and eliminate any that add information absent from the stimulus or that contradict the stated context, even if the alternative sounds true in general.
On nature-science items, the candidate substitutes a memorized formula or name for the analysis of the situation, applying it without checking units, scale, or the conditions under which it is valid.
Brazilian secondary science teaching often emphasizes formula recall, so under time pressure the candidate pattern-matches the topic ('oh, it's Ohm's law') and plugs in numbers immediately. ENEM frequently changes the scale (mg to g, mL to L, minutes to hours) or asks for a qualitative interpretation where the formula is a trap.
What to do instead
Adopt a three-step routine for every quantitative item: (1) list the given quantities with their units, (2) convert everything to the same unit system and write the target unit, (3) only then choose the relation. If the item asks 'explain' or 'conclude', answer in words first and use numbers only as support. Do a final dimensional check: if the answer's unit does not match what was asked, redo the calculation.
On mathematics items, the candidate sets up the equation correctly but fails to return to the question, delivering the intermediate value (x, the discriminant, the rate before adjustment) instead of the quantity actually requested.
Items are written in two or three layers: a real context, a model, and a final question that often asks for a total, a difference, a percentage, or a time. Cognitive load peaks at the end of the calculation, so the candidate stops as soon as a number appears and matches it to an alternative that was deliberately included.
What to do instead
Before solving, underline the final question and rewrite it as a target with a unit ('find: total cost in reais', 'find: time in minutes'). After obtaining a value, reread the target aloud and perform the last operation needed to reach it. Mark the intermediate result with a symbol and the final answer with a different one so you can see which is which.
On language items, the candidate treats English/Spanish or Portuguese literary texts as vocabulary tests, translating word by word or hunting for a single cognate instead of constructing the global meaning and the function of the text.
Foreign-language instruction in many schools focuses on isolated vocabulary and grammar, and ENEM foreign-language items are usually about purpose, tone, audience, or the effect of a specific expression. The candidate who reads word by word loses the genre and the speaker's intent, which is exactly what the alternatives test.
What to do instead
Read the foreign-language text twice: first for genre, source, and likely purpose (advertisement, opinion column, poem, instructions), then for the specific question. Use cognates and context to infer unknown words rather than stopping on them, and justify the chosen alternative by pointing to a line in the text that supports it. For Portuguese literature, identify the movement and the narrator's stance before judging the effect of a stylistic choice.
On data-reading items across all domains, the candidate compares absolute values on a graph or table without normalizing by population, area, time, or total, and concludes that the largest bar means the highest rate.
School assessment often rewards reading the highest point of a chart, while ENEM items frequently present absolute totals alongside rates and ask for a comparison that requires dividing by a base. The candidate also ignores axis labels, units, and the year or region to which the data refer.
What to do instead
Before interpreting any graph, read the title, both axes, the units, and the legend, and write down what the base quantity is. If the question involves comparison between groups of different size, compute the ratio (per capita, per hectare, per year) explicitly. Check whether the alternatives describe absolute or relative statements and reject those that confuse the two.
On essay writing (redação), the candidate produces a text that discusses the theme in general terms but never presents a thesis, an argumentative development with authorial position, and a concrete intervention proposal with agent, action, means, and purpose.
Many candidates prepare memorized formulas and generic repertoire and try to fit them to any theme, which produces a text that is grammatically acceptable but does not answer the specific prompt. The five competencies require demonstration of mastery of the standard norm, comprehension of the theme, argumentation, cohesion, and a detailed proposal, and a missing element caps the score regardless of eloquence.
What to do instead
Before writing, spend five minutes on a skeleton: a thesis sentence that answers the prompt, two arguments each with a concrete example or data point, and a proposal naming agent, action, means, and expected outcome. During revision, check each of the five competencies explicitly and delete any memorized passage that does not connect to the specific theme.
On items that ask for the function or consequence of a technology or scientific discovery, the candidate answers with the description of how it works instead of analyzing its social, environmental, or economic effect as requested.
The command verb is often the least salient part of a long stimulus, and candidates default to explaining mechanisms because that is what they practiced. ENEM science-and-technology items typically ask for implications, risks, or benefits, and the alternatives include accurate mechanism descriptions as distractors.
What to do instead
Circle the command verb in every item (describe, explain, compare, evaluate, conclude) and identify whether the question is about mechanism or consequence. If it is about consequence, discard alternatives that only describe functioning. Practice rewriting the question in your own words before evaluating alternatives.
During the exam, the candidate spends disproportionate time on a few hard items in the first hour, then rushes the final blocks and marks the answer sheet from memory without transferring answers carefully.
ENEM has 90 items per day plus the essay, and the score depends on the pattern of correct answers across easy and hard items, not on solving every hard item. Without a time budget, perfectionism on early items consumes the time needed for the many medium items that are worth more in the final score.
What to do instead
Set a per-block time budget (for example, about three minutes per item on average) and a hard stop rule: if an item resists after two attempts, mark a provisional answer and move on. Reserve the last 20 minutes for transferring answers and checking that no question is blank, since a blank is always wrong while a reasoned guess can be right.
On items about Brazilian social formation, the candidate treats a historically specific process as a timeless or natural fact, ignoring the period, the actors, and the structural relations named in the stimulus.
Everyday explanations often naturalize inequality and conflate different historical periods, so the candidate accepts alternatives that sound morally right but are anachronistic or that attribute to one group the role played by another. The items test the ability to situate a phenomenon in time and in a system of relations.
What to do instead
For each history, geography, or sociology item, note the date, the region, and the social actors involved before reading the alternatives. Reject any alternative that uses absolute words ('always', 'never', 'naturally') or that projects a present-day concept onto an earlier period. Anchor the answer in the causal relation stated in the stimulus.
After the exam, the candidate reviews only the number of correct answers and does not classify errors by cause, so the same type of mistake (misread command verb, unit conversion, ignored base rate) recurs in the next simulation.
Score-only feedback feels informative but does not identify the process failure behind the error. Without a taxonomy of mistakes, study time goes to new content instead of correcting the recurring reading and calculation habits that cost the most points.
What to do instead
Keep an error log with four columns: item domain, what the question asked, what you did, and the error category (interpretation, calculation, content gap, time). Review the log weekly and build short drills targeted at the two most frequent categories rather than rereading all content.