Definitely depends on you as a learner.
For me, I feel like lectures give me a vague impression, a bit like abstract art. It's useful having been to them in the sense that you know the whole thing was red with a squiggle of black, but don't ask me specifics about what it meant or where all the dots go.
The key to retaining something is understanding it and fitting it into the big picture in your mind. On that basis, ditch the lecture slides because they just list stuff but don't explain it in a way where your brain goes "oh wait, that actually makes sense".
Go out, get a relevant textbook and just bash through it. I make notes from textbooks and because unlike lectures they explain a lot more of the why, how etc. than just listing things, I find it sticks in my mind a lot better. Then I condense my notes into another set of better notes (which = re-revision) and do past paper questions. I should also point out that I do this in the few months before final exams each year rather than all year, because otherwise I'd forget it.
Flashcards really aren't my thing either. Memorising discrete facts doesn't work for me, I have to fit them into some kind of context in my mind. Stuff like the Kreb's cycle etc. I used to draw. I actually managed to get all of the relevant metabolism onto a single piece of card once, and basically just sat in the exam visualising how it looked. I still feel like I know sod all about it, but there are some things where it's just too much content to understand and you do have to try and just jam it in as random facts with arrows between them.
Same with mind maps. I spent ages making them one year and realised I couldn't recall them at all because I'd made so many and they all essentially just look the same, so visualising them in the exam was a massive fail.
What I would say is that the methods I used at school are still working for me now. You've already got tried and tested methods from A Levels or the IB or whatever. Don't let other people and their revision methods put you off - the people who work all year in the library, the ones who live their lives flashing cards at themselves - if those people are not = you, then don't try to become one of them. Is my advice :P
I used to have to get my own version of things into my head from the textbooks and not from the poxy worksheets or whatever the teacher had given us, and basically revised for my finals like that. The same is still true today. Or was for pre-clin/BSc type stuff. When you get to clinicals the whole thing changes in terms of how you receive information, how you're assessed, availability of past Qs etc., but you don't have to worry about that yet!