When you study make sure you are calm and concentrated when I was studying for my matric planning and scheduling helped me. Set time for your studies make sure you don't overdo it by studying until midnight as it might cause stress.take a break when you need to. Watch crash courses on the subjects you want on youtube. Also use supplementary books like extreme and galaxy and when you have about 2 weeks left start doing questions of the previous years as they are related. Finally stop studying and relax before the day of the exam. This method really helped me I hope it helps you too. Good luck!😊