Hello, Ranjan

You can take drop for preparation but you need to clear your 10th standard as well as 12th standard because the eligibility of jee main exam is that you should be pass out from 10th and 12th standard. so you can complete your 10th first and then 12th and after 12th you can think about drop for JEE. As syllabus of JEE is so much from 11th and 12th standard only.

BEST OF LUCK.