No. 1 Simple Hack, you can try out, in preparing for Board Exam
Chewing gums
Studies show that, if you chew a particular type of gum while studying, and then again right before you appear for your exam, then there are high chances of improving your test performance.
For example, if you happen to be chewing a strawberry gum, while studying formula in Science, you will be able to recollect them quite easily, if you chew the same gum right before your Boards, Science Examination.