I'm taking my GCSE-O Levels 2 weeks from now and I would like to say: Be careful when doing comprehension. Highlight key words in the comprehension question and look for details when answering.
For example, if the question asks you "What is the first symptom of AIDS?" Highlight the word 'first', because the question is asking you for 'first'; the other symptoms are redundant.
I don't know whether this helps.