If you understand the topic but still lose marks, the weakness may no longer be conceptual. Marks can disappear because you misread the question, retrieve the right idea too slowly, skip a required step, use imprecise language, make an execution error, run out of time, or fail to show the form of answer the examination rewards.
The next step is to classify the lost marks instead of calling them all “careless.” Separate knowledge errors from interpretation errors, method errors, notation or language errors, timing errors, and checking failures. Once the pattern is visible, practise the failing performance directly rather than revising the whole topic again.
Use the Examinations & Assessment Hub for exam performance, and the Diagnostics & Recovery Hub to identify the exact leak.