Hello aspirant
Hope you are doing well
The answer to your query is the paper is exactly same there is no change in paper only the sequence is changed and in some set physics comes first while in other it may be chemistry or biology .
It could not be predicted how many sets will be there in neet 2021 but last year there were 20 sets .
Beside this limited time is left for neet so you should do revision and sample papers it will help you to boost your confidence and secure good marks
Below is the link for the sample papers of neet
https://medicine.careers360.com/articles/neet-sample-paper
Good luck
Hope it helps

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