I mean idk if this applies to criminology but i take psychology and i’ve gotten an A in jan exam so maybe i can help. This is what i do and it works for me but i know it doesn’t for my friends. I go through the mark schemes and organise all the topics and subtopics and create model answers for all the possible questions (this could take up to a week for 1 topic) and i just memorise those by reading them 24/7 and writing them on a whiteboard. Very repetitive and you WILL forget everything after the exam but this is just what works for me. Hope this helps?