No limit .attempt As much As u can U 

But after 5 attempts U should Try for another field because 5 attempts are much. 

But if u want u can 

There  Is No Attempt Limit

Yes! Definitely, you can attempt neet 2020.

The upper age limit for the next exams was removed in 2018 and so now there is no limit to the number of attempts to make in NEET exam. So, all the best for 2020 exams.