NIT Raipur started with the Mining, Metallurgy, and Mechanical branches. These branches are highly regarded in the institute.

• An acquaintance of mine who is an NIT Raipur alumnus advises against dropping out. Even after dropping out a year, some students sadly do not live up to the expectations they had set for themselves.
• The best option in NIT Raipur is arguably mining. Some of the students of NIT Raipur prepared for the JEE to appear for a second time and they were able to score big. 

I do agree with my friend that it will be better if you pursue your studies along with the preparation for JEE Main. This way you will have a sense of security and a contingency plan if things don’t turn out as planned.