Do you have a list of all mandatory info? I know the SQA have them for Scottish science Qualifications. They call them ‘course support notes’ and they are a lifesaver because they only tell you exactly what you need to know.
If not, pick up some coloured flashcards, either:
1) make summary cards - you will find yourself only writing important info for each topic as you only have a small card to fit it all on. Highlight definitions and examples in different colours - or any other category. It helps to imagine you are making a cheatsheet for the exam. Look over these cards before you go in.
2) make definition cards - for a lot of definitions write the word on one side and definition on the other. When working through them and questioning yourself, you want to make two piles: one of definitions you get wrong and one of definitions you get write. When you finish the pack, pick up the pile you got wrong and repeat the process. Hopefully more cards will end up in the correct pile. Just repeat until you get them all correct.
3) make question cards - write question and answer, and use the same technique as for definition cards - a correct and incorrect pile, repeating the incorrect ones.
PATPAPER QUESTIONS - get an idea of the questions that come up again and again.
When marking, grab an extra sheet of paper and write the correct answer for any definition or explanation you got wrong. This will effectively give you a page of things you don’t know yet or need to go over.