As per NTA notification now for 2019-2020 neet us going to happen only once in a year .
As of now, there is no such notification released about NEET happening twice, moreover NEET is a hard exam to organize as compared to other exams like JEE as the paper get leaks many time.
So conducting NEET twice is not looking a possibility as of now. You have one attempt at the NEET, give your best.
Here is a link for some preparation tips:
Hope this helps, thank you.
NEET Online Preparation
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