Hello Legend 

Almost each and everyone had this while in class 11, including me. Wen i was in 10th i got somewhere between 80-82 %, i know it is not that good but the type of student i was in class 10, it was like 99 for me.

Getting 83, full on confidence, i chose science. And i flunked in 11th ( only in first term). Somehow i managed to pass class 11 with mere 42% but never thought of repeating it.

So, my request is that if you getting passed then please do not repeat it unnecessary. Work hard in class 12th and yes you can give NEET exam even after repeating class 11 because according to the guidelines there should be two years of regular and continuous study of Physics, Chemistry, Biology/Bio-technology taken together shall be required at 10+2 level for all the candidates. It means for example i am class 11 in 2019 (will be giving exam for 11) and i fail the exam then again i will write in 2020 and 12th in 2021 and hence there is the two year continuity.

"Successful people don't fear of failure but understand that one need to learn from those failures".

You can repeat your 11th class. And after that give your 12th class exams and pass them with flying colours and then you are eligible for NEET Exam.

Good Luck