As JEE Main Exam is the toughest engineering exam conducted in India, you should be prepared well for it.
First you have to check the complete syllabus and exam pattern and plan your preparations accordingly.
Refer best books and study materials for your preparation.
Solve previous year JEE Main Question Papers and take online mock tests. This will give you an idea about the pattern and difficulty level of the questions.
Improve your weaker areas. Focus more on the topics in which you are weak.
Study at least 6–7 hours and give your last 30–45 mins to the revision daily.
Always carry a notebook and write down all the important formulas, derivation or anything important for the exam. You have to ready those notes daily at least once a day. These notes will also be helpful for your last minute preparation.
While preparing for the JEE Main Exam you should take care of your health as well. Avoid eating junk food.
Best of Luck!