I didn't really revise in a conventional way, there was some site that you listened to someone like talking and I used that for History whilst I did other stuff. For science I kinda just read the revision guide and memorised the answers. Some subjects didn't really need revision, I'd say GCSE revision is just not comparable to what I know as revision now at A level. I mean I didn't get the best grades though, so maybe if I put in the work I could've done better.
I got 1A* 8As 3Bs (2 of them in Double Award Engineering though) and half a C grade in Citizenship but that was in year 10.
But you have linear exams now in GCSE right? I had modular exams, so I knew when I did my exams that I was like bound to get certain grades, which meant I didn't really bother.