If you are taking a drop for JEE make sure you should be determined to get NITs or IITs. To crack your exam your basics should be clear you can take help of NCERT books for that to clear your concepts and to build your fundamentals strong. Complete your whole syllabus focus on important topics you can make your important notes which will help you in revision. You can solve MCQs related to important subjects for your practice. You should also solve complete mock test series to analyze your preparation level at regular interval of time.

All the Best!!