Is it useful to worship Buddha before the exam?

Buddha and Bodhisattva will give you wisdom and let you understand the truth of rewarding diligence in heaven. Study hard. No pains, no gains.

The purpose of going to the temple should be to worship Buddha, so as to eliminate karma, keep the body and mind clean and make the examination room work normally and smoothly. It's not that you burn more expensive incense, buy more expensive offerings and donate more money to protect your high score in the exam. Burning incense, offering Buddha, giving alms, and worshipping are all good causes, and there will be blessings. If you have a pure heart, you will accumulate merits.

The key is to sincerely repent your mistakes and turn evil into good after taking an oath. This is the spirit of sincerity.