I have a really good exam technique that worked for my friends in uni and was really good for my GCSE mocks.
All you need is a quiet room and a clock to put in front of you at your desk.
-Wake up at around 7.40a.m. and do your morning routine. Bang on at 8, sit at your desk and start revising, making notes, posters, mind maps, use COLOUR, do past exam questions, or look at examiner reports. Do any of these for 40 mins.
-Then at 8:40, do what you want, probs something productive like having breakfast, cleaning (if you can be bothered lol) for 20 mins.
-Repeat these steps for 9,10,11,12 and 1 o'clock and stop at around 2p.m., when you're FREE!
This will help refresh your mind and also make you remember things a lot better. Do this every weekend or weekday in study leave.
Hope I helped. REVISE! You'll get it over and done with and you'll have your good grades to be happy about. It's worth it y'know.
Good luck!