I don't think I'm able to do well

I'm doing A level law and am in my upper 6th, and I just can't remember cases or anything worthwhile in exams I don't think. I have a verry good understanding of law but when it comes to remembering things it just doesn't go in as well as I need it to, furthermore I'm just a lazy git who loves the subject, but obviously not enough to put in the work and it just pisses me off. Also the idea of an exam being solely based on memorisation is bollacks, it's not something practical or actually helpful for future life. Sorry about this but this just feels a bit shit.