I think self study is the best way to prepare for the next exam, give enough time to learn your subject and prepare each and every topic of your subject syllabus for good scoring.
If you have any doubt or issue in subject then first go to your school or collage teacher to resolve this issue and if the issue is not resolve then go for private tutor of expert by which you can clear you doubts or issues easily.
Best of Luck!
-Tim
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