Published October 06, 2026 · IECC Editorial
7 Common Mistakes That Cost Candidates 10 Points
These are not knowledge gaps — they are unforced errors. Fix them and your score rises without learning a single new fact.
Mistake 1: changing right answers to wrong ones. The research is clear — first instincts outperform changed answers on average. Change an answer only when you can state a specific, concrete reason ("I misread the timeline; the question asks for Q3, not Q2"). "It just feels off" is not a reason; it is anxiety wearing a disguise.
Mistake 2: leaving questions blank. On assessments without negative marking — which is nearly all of them — a blank is a guaranteed zero while a guess has positive expected value. Even random guessing on five questions statistically earns more than one point. Educated guessing earns far more. Never submit with blanks.
Mistake 3: misreading the qualifier. "Which is LEAST appropriate," "the BEST first step," "all of the following EXCEPT" — these qualifiers invert or constrain the task, and skimming past them is the single most common reading error. Underline the qualifier mentally before touching the options.
Mistake 4: front-loading time on hard questions. Spending five minutes on one hard question while ten easy ones wait is catastrophic arithmetic — the hard question and each easy one are worth the same. Flag and move on; return with remaining time.
Mistake 5: ignoring the obvious. When stuck between a simple answer and a clever one, candidates often talk themselves out of the simple one — "it can't be that easy." On well-designed professional assessments, it frequently is that straightforward. Complexity bias costs real points.
Mistake 6: pattern-guessing. "I haven't picked C in a while" or "the answers can't all be B" — test options are randomized or balanced deliberately, and perceived patterns are illusions. Choose each answer on its own merits. The test does not know or care about your answer distribution.
Mistake 7: the fatigue fade. Scores measurably dip in the final quarter of long assessments as attention degrades. Counter it structurally: plan a 30-second reset at the three-quarter mark — sit up, breathe, roll your shoulders. And save a few easy questions for the end if the format allows; finishing strong protects against the fade.
Add these up and the typical candidate is donating 8–12 points to errors that have nothing to do with competence. That is often the entire margin between pass and fail. The good news: unlike knowledge gaps, these fixes take an afternoon to implement and work immediately. Fix the errors first; then go learn the facts.