I would recommend looking at doing a quiz on what type of learner you are. It can help give you a bit of an idea what type of revision would likely be best for you.
I'm partly a visual learner, so adding lot's of diagrams and colours really helps me remember things. If I need to remember a certain process whilst doing a question (especially 4,5, or 6 mark ones) I'll draw out a mini version of what happens. I can then remember all the things that happen in that process.
Most definitely revise smarter, not harder. It's best to find the right technique for revision instead of just doing more of a method that isn't working. I do revision in 30 minutes slots. The best 30 minutes has a five minutes break, then another session and a ten-minute break, then 30 minutes and another five-minute break. That way I don't end up having my attention wander after a few hours of revision. It's also much better than doing a massive chunk of several hours with an hour's break at the end. It's shown that your brain stops paying attention after around 30-40 minutes, which is why teachers often do a different activity or task after around that time period. It helps you keep attention and retain information if you don't do everything in one big chunk of work. I know some people like to do as much work as they can in one go and if that works for them it's fine. But I do find doing shorter sessions can help.