WHAT R THE STEPS TO BE FOLLOWED TO GET A RANK BELOW 100 IN JEE?I AM IN 12...WAITING FOR UR SUGGESTION

Practice is the key
Pick few good books like that have many problems. Solve the problems: both subjective and multiple-choice.
Subjective problems help you build your concepts, while practising MCQs will help you learn smart tricks that are useful in the exam. While practising MCQs, try to develop this skill of smart thinking: without actually solving the problem, see if you can eliminate few options quickly, or get the correct answer directly.