As you told that you are in class 11th then You have enough time to be well prepared for the exam. The syllabus of the exams is from claas 11th & 12th mostly so if you are clear with the basics, You can easily cover whole the syllabus.
In order to crack JEE Main exam make sure your concepts are clear. Your fundamentals should be strong. You can take help of NCERT books for that. Complete your syllabus first you can focus on important topics. You can solve MCQs related to important topics for your practice. You can refer previous year papers to understand the exam pattern and level of questions.
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For cracking the jee mains examination make sure you join some coaching institute
Also you must study regularly everyday.
Make sure that you grasp the concepts well.
Solve plenty of problems
Solve the previous years'questions.
All the best.
Hope this helps.
Now from 11th class onwards you have to make your base strong, study regularly for 5-6 hours, clear all your concepts, no doubts should remain uncleared, join a distance learning program or join coaching, give tests regularly and analyze your strong and weak points, Discuss your doubts with your friends, and at last revise regularly and I bet you will score awesome marks in Jee.
Hope it helps.
hey dear,jee main is most popular exam for engineering aspirants and many students prepare for it very early.So 11th class is a very good time you have decided to start preparing for it.first of all prepare all the NCERT books ,they are very helpful and than move for high level book for reference.