The qualification eligibility required to appear for NEET requires a minimum of 50% aggregate in 12th for a general candidate, 40% aggregate for SC/ST/OBC candidates and a minimum of 45% aggregate for PH/PWD candidates.These minimum marks are of Physics, Chemistry, Biology/ Biotechnology and the candidate have to clear all the exams separately.

The total aggregate of the three subjects should be a minimum of 50% and you got 56.61% so you are eligible also you have cleared all the exams separately so there is no need to give board exams again, until and unless tyou have to improve your marks.

I hope this answers your question.

Hello there, you just have to pass your class 12 and that's all.(according to the prescribed eligibility criteria by CBSE) Thankfully, there no such specific minimum percentage required.you need to score more than 50%marks in PCB. 

hope you find it helpful