Hey Adarsh,

It completely depend upon you.If you have confident on yourself that you will get a good college(NITs/IITs) by droping,then i will recommend you to definitely drop.

Let me tell you,I'm also a repeater! I wasn't getting any good college during my current year,so i took one year drop and now i am in one of the NITs(CSE).

So you see,it completely depends upon you!!

All the best

Thanks

Hello Adarsh
See it's your own personal choice. There's no particular time requirement for Jee Mains/Advanced coaching. I have seen people crack IITs with just some months of coaching too. It all come downs to what suits you the best and what makes you feel more confident. If you believe it would be difficult for you to balance both the 12th examinations and you seek to devote extra time for JEE preparation, you can go for one year drop. 
Hope this helps
All the best for your decision.