Keep an Error Log to Turn Mistakes into Marks

For every wrong question, write the topic, what you did, and the exact point where it went wrong in one line. "Sign error when moving a term," "used degrees instead of radians," or "forgot to divide by 2" are specific notes, not "careless."

A pattern usually appears within two weeks, and that pattern is your highest-value thing to fix.

Careless slips, method gaps, and never-learned topics each need a different response. Careless slips are fixed by a checking routine, method gaps by redoing similar questions, and unknown topics by proper re-teaching.

Sorting your log this way stops you from grinding endless practice when the real problem is one missing concept.

A week before any test, reread your error log first, because it is a personalised summary of your own weak points and far more efficient than flipping the whole book. In our one-to-one lessons our teachers help you keep this log and choose which errors to attack first.

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A useful log entry is short and specific. Write down the topic (for example, "Indices, negative power"), the exact line of working where things went wrong, what you wrote versus what it should have been, and a one-line fix in your own words.

Skip long explanations, you already understand the topic in general, or you would have logged a concept gap instead of a slip. The point is to capture the exact moment your working turned wrong, so that the next time you meet a question with the same shape, the memory of this entry surfaces before you repeat the move.

A page split into topic, mistake and fix works well; keep it in the same notebook you use for practice so you are not managing two systems. Five minutes after marking a paper is enough time to add every entry from that session, do it immediately, while the working is still in front of you, not the next day when the details have faded.

A single entry tells you about one question. Ten entries, read together, tell you about you.

After two or three weeks of logging, go back and read every entry in one sitting, not to redo the questions, just to look for repeats. Maybe every careless-error entry involves a negative sign in the second line of working.

Maybe every concept-gap entry involves converting between units before substituting into a formula. Maybe every misread-question entry happens when a question stacks two instructions in one sentence.

Once you can name the pattern, it stops being twenty separate mistakes and becomes one habit to fix, and one habit is something you can actually target, by slowing down at that exact step for the next few weeks of practice. This weekly review is where the error log earns its keep; without it, the log is just a diary of things you already knew went wrong.

In the last stretch before the exam, an error log becomes more useful than the textbook. Instead of rereading every chapter, open the log and read only the fix lines, the one-sentence reminders you wrote for yourself over the term.

This is a revision list built entirely from your own weaknesses, which makes it shorter and more relevant than any generic checklist. Read it the evening before the paper, not to learn anything new, but to put each fix back at the front of your mind right before you need it.

If a fix line still feels shaky when you reread it, that is a signal worth one more short practice question, not a full topic review. Students who keep a log across Form 4 and Form 5 often find that, by the final months, the same handful of habits keep reappearing, which is exactly the sign that the log is working: it is catching what would otherwise still be losing marks.