If you are asking for Gap then yes, you can drop one year for your Jee preparation because the current eligibility criteria says that student can give jee mains thrice and jee advanced twice consecutively when he/she is in 12th so keep this thing in your mind.

For further detailed eligibility criteria, you can go through the below provided article -

Jee Main Eligibility Criteria

Hope this helps!!!

It depends on you If you think that you are not well prepared for the exam that it will be good option to take one year drop. There is no any problem and you can do hard work on your study with quality. You can join any coaching as per your convenience & start to do the practise with previous year papers.

Good luck!