here are some specific tips to score well in exams :
If its the science exam, practice the diagrams. and for maths exams, practice all the kind of problems and the formulas also. for social, always keep the important points and dates in mind. for English exams, you can practice grammar worksheets and reading comprehension from the internet itself or from any work books. and solving sample question papers for all the subjects can get you success in your exams.
SOME GENERAL TIPS BEFORE EXAMS :
⇒ schedule your sleep
⇒ drink water often
⇒ don't get too comfortable in your chair
⇒ clear your desk of everything you don't need
⇒ don't plan to study non stop
⇒ take breaks every hour
⇒study at the same time same place
⇒ spend as much time as possible with your teachers for doubts
⇒ last but not the least prepare check list so that you don't forget the required materials.