11 olympiad preparation mistakes, and what the evidence says instead
By The Sophoz Curriculum Team
The short answer. The most expensive mistake is practising one topic at a time, because it produces high accuracy during practice and poor retention afterwards. The second most expensive is treating the Achievers Section as a bonus round when it carries 25 % of the marks in five questions. Most of the rest follow from a single error: judging a practice session by how it felt while it was happening.
Each mistake below is paired with what the research supports. Where the research does not support a confident answer, that is stated rather than papered over.
1. Practising one topic at a time
The mistake. Twenty ratio questions, then twenty average questions. It is what workbooks do by default, and it feels productive because the child gets most of them right.
Why it costs marks. In Rohrer and Taylor's study, blocked practice produced 89 % accuracy during the session and 20 % a week later. Mixed practice produced 60 % during and 63 % a week later. In a randomised trial with 787 seventh-graders under normal classroom conditions, interleaved practice scored 61 % on a delayed test against 38 % for blocked, with an effect size of d = 0.83.
What to do instead. Once the method is secure, stop grouping. Twelve mixed questions is worth more than thirty blocked ones. Expect it to look worse while it happens, because that is the finding rather than a side effect of it.
Why this is hard. Blocked practice looks like a good session. A parent judging by the visible signal will consistently choose the worse method, and every workbook on the market is organised to make that easy.
2. Skipping the Achievers Section because it is hard
The mistake. The Achievers Section sits at the end, has five questions, and is the section children run out of time for and parents treat as optional.
The arithmetic. Five questions out of thirty-five for classes 1 to 4, carrying ten of forty marks. Five questions out of fifty for classes 5 to 12, carrying fifteen of sixty marks. Either way, 25 % of the paper, at every class level, in every SOF subject.
Two children each get five questions wrong. The one who drops five ordinary questions scores 55 of 60. The one who drops all five Achievers questions scores 45 of 60. Seventeen percentage points apart, same number of errors.
What to do instead. Allocate roughly a quarter of preparation time to it, matching its weight. And practise it first in a session rather than last, because it is the section that needs a fresh brain and it is the section that always gets a tired one.
3. Ignoring Logical Reasoning because it is not a school subject
The mistake. Reasoning is not taught in most school syllabi, so it gets treated as a section you either have a knack for or you do not.
The weighting. Logical Reasoning is 25 % of the SOF IMO paper at every class level up to 12. In ISO it is 12.5 % for classes 1 to 4 and 16.7 % for classes 5 to 10.
And the trap after it. At Level 2, across IMO, ISO and IEO, the Logical Reasoning section disappears entirely and its marks move into the subject section. A child who qualified partly on reasoning strength is sitting a materially different paper the second time and usually does not know it.
What to do instead. Treat reasoning as a subject with its own practice. MTG's class combos include a dedicated reasoning workbook, and CREST runs a whole Reasoning Olympiad.
4. Reading worked solutions instead of reconstructing them
The mistake. The child reads the solution, follows it, agrees with it, and moves on. Nothing has been retrieved.
The evidence. Students who read a passage then tested themselves recalled 56 % a week later; students who read it four times recalled 42 %. And the rereaders predicted they would do better. In the largest review of study techniques, only practice testing and distributed practice earned a high utility rating; rereading and highlighting both landed in the low tier.
What to do instead. Read the solution once. Close it. Write it out from scratch. The gap between those two activities is the entire difference between recognition and recall, and only the second one is on the exam.
5. Doing all the preparation in the last fortnight
The mistake. Eight weeks of intention, two weeks of work.
The evidence. Across 317 experiments, spacing improved final performance in 259 of 271 comparisons. For an exam ten weeks out, the optimal revisit interval works out to roughly a fortnight.
What to do instead. Four twenty-minute sessions a week for eight weeks beats every evening for two. And deliberately revisit week 2's material in week 6, when it has faded. The fading is the point: retrieving something that has started to go is what makes it stay.
One honest caveat. The spacing meta-analysis is built mostly on verbal recall with short retention intervals, and the authors note insufficient data on children's long-term retention. Use "roughly every fortnight" rather than a schedule built to the day.
6. Letting a young child struggle before teaching them the method
The mistake. Handing an eight-year-old an unfamiliar problem and waiting, on the theory that discovery is better than instruction.
Why this is the most commonly given wrong advice in the category. The meta-analysis of productive failure, covering 45 articles and 166 comparisons, finds an overall positive effect on conceptual knowledge, g = 0.36, a null effect on procedural knowledge, and, critically, negative effects for grades 2 to 5. For those children, instruction-first outperformed problem-solving-first. The authors suggest younger learners lack the metacognitive strategies the approach requires.
What to do instead. For a child under about eleven, teach the method, then practise it, then mix it. Struggle has a place, later.
7. Using a timer for the wrong thing
The mistake. Timing every practice question from day one, on the theory that the exam is timed so practice should be.
Why it backfires. Maths anxiety consumes the working memory a child needs to do mathematics. The effect is largest on advanced multistep problems under consequential conditions, and, counterintuitively, it is largest for children with higher working memory, who are pushed off the sophisticated strategies they would otherwise use. That describes a capable child under a stopwatch on an olympiad problem precisely.
What to do instead. Untimed while learning a method. Timed for full papers only, which is where timing is actually the skill being practised. One timed paper a week is enough.
8. Buying preparation before checking the syllabus is secure
The mistake. A child is finding maths hard, so olympiad practice is added to help.
Why it makes things worse. Olympiad problems assume the year's fundamentals and then complicate them. A child shaky on equivalent fractions will fail at step one of a problem whose interesting part is step three, and will conclude they are bad at mathematics, which is expensive to undo.
What to do instead. Fix the gap first. This is the single rule Sophoz applies to its own olympiad product: it is not for a child who is struggling with the current syllabus.
9. Treating the rank as the outcome
The mistake. The preparation is framed around the rank, so the rank is what gets reacted to.
The evidence, such as it is. The claim that olympiad participation produces mathematicians is a selection artefact. Outcome rates among IMO team members describe people already selected for extreme ability, with no control group anywhere in the design. A 2022 review notes that despite competitions existing for over 125 years, there is minimal quantitative evidence on their effects on learning or motivation.
What to do instead. Frame the eight weeks as the outcome, because the eight weeks is the part with a demonstrable mechanism behind it. The rank is information.
10. Buying the official trainer in February
The mistake. Buying access to the SOF Olympiad Trainer close to the exam.
The term that is not on the purchase path. Access expires on 31 March of the following year regardless of when it was bought. A February purchase buys weeks. An April purchase buys a year, for the same money.
What to do instead. Buy at the start of the cycle or use the free stack. The same applies generally: check expiry terms on any olympiad subscription, since several in this category are cycle-dated rather than duration-dated. Olympiad Success subscriptions, for instance, run to a fixed February date.
11. Sitting every exam the school circulates
The mistake. SOF's six subjects, plus SilverZone, plus CREST, plus Unicus, because each individual form seemed reasonable when it arrived.
Why it fails. Each paper is defensible on its own. Twelve commercial multiple-choice papers in one academic year is not a plan, it is an absence of one, and the preparation spreads so thin that none of the mechanisms in this article get to operate.
What to do instead. One core exam in one or two subjects, one optional extra at most, chosen before the circulars arrive rather than in response to them. The full map of who runs what is in every olympiad exam in India.
The pattern underneath all eleven
Nine of these eleven come from the same root: judging practice by how it feels while it is happening.
Blocked practice feels better than mixed practice and teaches less. Rereading feels better than self-testing and retains less. Massed cramming feels more productive than spaced revisiting and fades faster. In every case the method that produces the better session produces the worse exam, and the learner's own prediction of which is working is reliably wrong. Roediger and Karpicke's rereaders predicted they would remember more, and remembered less.
Bjork's term for this is desirable difficulty: conditions that slow acquisition and make practice feel harder frequently improve retention and transfer. With one boundary that matters for children and gets dropped from the popular version: a difficulty is only desirable if the learner has the prior knowledge to meet it. For a child two years below the content, mixing problem types is not a desirable difficulty. It is noise, and it is mistake number 8.
Frequently asked questions
What is the biggest mistake in olympiad preparation? Practising one topic at a time. Blocked practice produces higher accuracy during the session and substantially worse retention afterwards: 89 % during practice and 20 % a week later in one study, against 60 % and 63 % for mixed practice. The method that looks better while it is happening is the one that fails on the paper.
How much time should go on the Achievers Section? Roughly a quarter of preparation time, matching its weight. The Achievers Section is five questions in every SOF paper and carries 25 % of total marks at every class level, at two marks per question for classes 1 to 4 and three for classes 5 and above.
Why is my child scoring well in practice but badly in the exam? The most likely cause is blocked practice. Working through one topic at a time removes the hardest step, which is identifying what kind of problem this is. An exam paper restores that step, and a child who has never practised it under mixed conditions meets it for the first time on the day.
Should I time my child's olympiad practice? Not while learning a method. Maths anxiety consumes working memory, with the effect strongest on hard multistep problems under consequential conditions and strongest among children with higher working memory. Keep timing for full practice papers, roughly once a week.
Is it better to cram before the exam or spread preparation out? Spread it out. Spacing improved final performance in 259 of 271 comparisons across 317 experiments. For an exam around ten weeks away, revisit each topic roughly every fortnight, deliberately returning to material after it has begun to fade.
Every research claim here is sourced in what the research says about olympiad preparation, where the studies are linked and the caveats are set out in full.