i memorised for exams and forgot everything a week later
I was pretty good at exams. Like, genuinely good. I figured out early on that you didn't need to understand the material, you needed to know what the question was probably going to be and have a rehearsed version of the answer sitting ready. It worked. My parents would put the results letters on the fridge. I remember the specific smell of that kitchen, magnets and something faintly gassy from the cooker, feeling pleased and also kind of blank at the same time. I thought that was just what achievement felt like.
I'm still not sure I've fully fixed it. I switched to trying to understand things rather than memorise them and my marks got a bit worse for a while which was uncomfortable. But I can actually remember what I studied last term, which is new. It's a strange trade off and I don't think anyone tells you it's a trade off at all.