I too did Revolutions as my 3/4 as a Year 11 this year, so I want to give you my advice and the things I wish I did and didn't do.
First of all - aim high! At the start of the year I said to myself I would be happy with just a 25, because I didn't believe I actually had the ability to get any higher. That's not to say I didn't try, but I definitely did not put as much effort into it as I should have, simply because I thought I would just be disappointed in the outcome, and 'what was the point?'
Another regret I have was not asking questions. For me at first I didn't really enjoy Revolutions - not because of the content or the teacher, but my class was half Year 11's and half Year 12's therefore we were too embarrassed to say anything in front of the Year 12's as they were unfriendly and unapproachable. As a result, I did not look forward to the lessons and I subsequently did not put in the effort I should have. That is, I should have asked my teacher during the lessons things I didn't understand straight away, rather than forgetting about it later and ultimately, having gaps in my knowledge.
I also wish that after every lesson, or at least at the end of every week, I typed up summaries of things we had learnt that day/week, about things such as events and their impacts and the influence of significant individuals. This would have saved me so much more time before all the SACs and the three exams I sat for it, and I know for a fact I could have done so much better in Revs if I had just done this simple step.
Also - make sure you cover the whole study design. I mean all of it - SERIOUSLY. I did the Russian Revolution for Section B and my teacher did not once cover in class women of the Revolution and individuals such as Alexandra Kollontai. I didn't know until about a month before the exam that this was on the study design, and since we never covered it, I completely disregarded it. And what happened? Part 2 of Section B for the Russian Revolution on the exam was all about women and Kollontai - I easily lost at least 15 marks in this section, and I am so disappointed because if I did actually have some knowledge, I would have gotten an A on the exam easily.
Also make sure to read- not just absent mindedly though. I found if I went through my books without highlighting information as I read it, I forgot in a matter of seconds what I had literally just read. In Unit 4 I begun to go through with three highlighter colours, (one for quotes, one for facts and statistics, and one for important info) and this helped me remember things so much better because I had to literally think about every single sentence and if it was useful to know or not.
If you need any more advice feel free to message me, I know I only got a 35 but I definitely think I was capable of getting at least a 40 if I actually tried properly!!