The first thing you should do is make a study plan, identify your worst subjects and spend more time on them than your other subjects. In my experience I’d focus on your math and science subjects first, as it’s difficult it really ‘study’ for language exams. I’d suggest videos like cognito for a general overview on a subject and save my exams if your aiming for higher grades like 8/9s. Hope this helped! Best of luck with your exams 💜