Dear Shameemayan,

You don't need to loose hope. You can improve your physics. You need to be dedicated and motivated towards your study.

In order to improve your physics you should start to work on your basics and you should memorize basic equations. You should learn score boosting strategies. 

You can make your important notes which will help you in revision as well. If you want you can use flashcards. 

Focus on the topics which carries more weightage in the exam. 

Solve as many as MCQs for your practice. 

All the Best!!