1. Don’t leave Mains-specific topics like Statistics, Mathematical Reasoning, Relations, Heights and Distances etc. These chapters are easy and have a very high probability of being asked(Parabola type questions can be asked in advanced also but not these chapters)
2. Don’t leave NCERT for Chemistry and Physics especially.
3. Try to cover all chapters up to a minimum level rather than covering some chapters to a Pro-Level, as in Mains most of the questions will be easy to moderate level so it makes sense to prepare all up to an average level(for JEE aspirants)
4. Don’t think in terms of marks during the examination, just keep one mindset while attempting the paper- ‘Let me first find out the easiest and less time-consuming problems in the paper in all three subjects and solve them first properly’, without calculation mistakes and pressure.
5. Don’t have ego issues with a question. If a seemingly easy question refuses to get solved, just leave it instantly (don’t try any question for more than 7-minutes in examination while attempting the paper in the first round(even if you feel like - I have already wasted so much time so let me try for 2 minutes more)). Keep in your mind that one question is sufficient enough to ruin the entire paper.
6. Have proper sleep and food etc. on the day before Mains. Last minute study (sleepless) may fetch you 4-marks more but your sluggish brain (due to sleep deprivation) can cost you 40–50 marks or even selection.
7. Don’t get overly worried, if you have studied sincerely then forget about the rest and don’t blame yourself for anything. It’s not a life lost, you will still have one more chance. You will perform best when you have the least worries.

All the very best.

Hello Jatin,

There will be two papers in JEE Mains exam that are Paper-I and Paper-II. Paper-I consists of 90 objective type questions from Chemistry, physics and Mathematics subjects. It will be online and candidates will have to give the answer using computers. so it is completely computer based test. 

Whereas, Paper-II will based on computer and Pen-Paper Mode. Mathematics and Aptitude test will be computer based and Drawing test will be in pen-paper mode.

For more details you can check JEE Mains exam pattern