A regular study always gives a good result. According to me study few hours daily but with full concentration and consistent would be sufficient to crack IIT-JEE.
Some Suggestion given below which will be help you to study in better way.
1.Before starting any new topic, make a fresh revision of topic which you have studied.
2. Make revision as a important part of your study and your revision should be completed well before your IIT-JEE exams.
3. During your study concentrate more on important lessons, diagram and formulae.
4. Try to make habit of reading text book, after reading any topic make its summery. a summery f topic will help you to understand the topic with short span of time.
5. Try to make your own notes rather than taking from your friend.
6.During study memorize essential facts and formulas . try to study essential facts and formulas more intensely so that you can recollect them better.
7. make habit to write answer in best way like " underline the important words" this will put good impression on examiner.
