Hello Srijit,

I hope you are doing well, I think there may not be any coaching center providing preparation especially for NEST. There is no need to take any coaching for NEST especially. If you prepare for JEE Advanced/AIIMS  in addition with NCERT textbooks and keep yourself updated with the recent scientific affairs. I think it would be enough for you.

I hope you find this information helpful. I wish you all the best for your future.

Good Luck.