How to review wrong MDCAT answers: the error-log method

A common habit is to mark a practice paper, note the score and move to the next paper. The score changes; the mistakes do not. A short review method fixes that.

Why a wrong answer is worth more than a right one

A right answer confirms what you already know. A wrong answer shows the edge of your knowledge: a missing fact, a misread stem, a unit error or a guess that happened to work.

That information is valuable only if you record it. A mark on the page is not a record. By the next day you will remember the score and forget the reason.

The method below takes 10 to 15 minutes per review set. It is not glamorous. It is the part of practice that turns volume into progress.

Build the error log before you need it

Use a table with nine columns. A notebook works. A spreadsheet works. The format matters more than the tool.

Fill the first six columns during the review. Fill the rule after you understand the cause. Fill the result after the reattempt.

Keep the log small. A 30-question set with seven errors needs seven rows, not 30. The rows you skip are the ones you already understand. The log is a list of gaps, not a transcript of the session.

Classify the error in one of four ways

A knowledge error means you did not know the fact or could not recall it. The fix is coverage and retrieval, not more questions on the same topic.

A reading error means you knew the content but misread the stem, missed the word "not", or chose an option that answered a different question. The fix is a slower first read and a mark on the key word.

A calculation error means the method was right and the arithmetic, unit or sign was wrong. The fix is a written routine: given values, conversion, equation, substitution, check.

A guess means you had no reliable reason for the answer. Mark it as a guess even when it was right. A lucky guess is a gap with good timing.

Rewrite the rule, not the answer

The rule is the only column that changes future behaviour. Write it as a trigger and an action: "When a question asks for the direction of an induced current, use Lenz's law and check the sign."

A rule such as "revise circuits" is too broad. A rule such as "in a series circuit, the current is the same through each component" is usable.

Write the rule in your own words. A copied sentence from the explanation is easy to write and hard to apply. If you cannot shorten it, you do not own it yet.

A good rule fits on one line and names the condition. "Check the units" is weak because it does not say when. "When a formula uses mass, convert grams to kilograms first" is a rule you can use at the start of a calculation.

Reattempt after 48 hours

Two days gives the memory time to fade a little. That is the point. If you reattempt immediately, you are reading your short-term memory, not testing the rule.

Hide the answer and the explanation. Solve the question from the start. Then check both the answer and the reason. A right answer with a wrong reason is still a gap.

If you get it right, mark the result and keep the rule. If you get it wrong, rewrite the rule and schedule another reattempt. Two failures on the same rule mean the underlying chapter needs a visit, not another card.

Log the source so you can find it again

"The Physics paper" is not a source. "UHS 2024, question 87" is a source. For a practice set, record the chapter and the question number.

The source lets you return to the exact question, compare it with a similar one and show the error to a teacher or a tutor. It also stops you from logging the same question twice under two different descriptions.

If you use past papers, the paper and question number are already on the page. Copy them before you close the tab.

Review the log weekly, not nightly

A nightly review turns the log into a diary. A weekly review turns it into a decision.

Once a week, count the errors by class. If most are knowledge errors, the problem is coverage. If most are reading errors, the problem is pace or attention. If most are calculation errors, the problem is the routine.

Choose the two topics with the most errors and put them in next week's plan. Choose one rule that failed twice and rewrite it. Leave the rest. A log you try to fix all at once becomes another unfinished project.

Put the review in the calendar. Thirty minutes on a fixed day is enough. If you skip it for two weeks, the log becomes a museum of old mistakes rather than a plan for the next one.

What to do with a guess that went right

Log it. The score is right; the reasoning is missing. A guess that goes right in practice can go wrong in the exam, and you will have no way to tell the difference.

Reattempt the question after 48 hours and explain why each wrong option is wrong. If you cannot, the content is not learned. Treat the guess as a knowledge error for planning purposes.

This one habit makes practice scores more honest. A student who logs guesses discovers that the real score is lower than the marked score, and then fixes the gap before the exam does it for them.

A worked example of one log entry

Date: Monday. Source: practice set, Current Electricity, question 14. Type: calculation. My answer: 2.0 A. Correct answer: 1.5 A. Rule: "For a cell with internal resistance, use E = I(R + r), not E = IR." Reattempt: Wednesday. Result: right.

The entry is short. It took two minutes. The rule is specific, the source is findable and the reattempt date is set.

A second example, this time a reading error. Date: Tuesday. Source: English practice, Reading Comprehension, question 4. Type: reading. My answer: option C. Correct answer: option A. Rule: "Answer the question the stem asks, not the topic of the passage." Reattempt: Thursday. Result: right.

A page of entries like that is more useful than a page of highlighted notes. It tells you what to do on Wednesday.

When the log shows a content gap

If the same chapter produces knowledge errors three weeks in a row, stop adding questions. Go back to the chapter map, read the section, work two examples and then answer ten questions.

Use flashcards for the facts and practice for the application. Keep the chapter in the weekly review until the errors fall.

If the chapter still does not work, ask for help. A teacher, a classmate or SAGE can explain the step you are missing. The log tells you exactly what to ask, which is half the value.