Also in terms of revising effectively- when i started the course, I encourage revising as you go- we finished our syllabus so late but I didn't care as I had a tutor who helped me learn all the content and I myself had revised all content a month of two before the exams.
Once you've revised a set topic etc- make sure your notes are condense but informative. Keep going over things you don't understand and use all the resources out there to make sure you get it, like when I studied Micro Market Failure diagrams it confused me at first but then I watched econplusdals video and it made so much sense.
I really think if you want the best grades you have to really push yourself in terms of having a time table- for revision time. In year 12 I had one- but i didn't really use it till the end of year 12 as i found it hard to stick to.
One youtuber I think recommended this- 8 hours of study, 8 hours of sleep and 8 hours of anything else, and ive stuck to it, it really helps you effectively use your time. Also Last bit of general advice- USE YOUR FREE PERIODS EFFECTIVELY! I had so many in a weekday as i only did 3 A-Levels and each one i had a plan of what i was going to do in that hour etc, if you have a plan and stick to it you will always succeed.(At least I hope you do!)