Hello aspirant
Hope you are doing well
You have not mentioned your category so let us assume you are general category candidate  and if you score 400- 450 marks in neet 2021 and if we see previous year marks trends so it is difficult for the general category person to get college so you should score above 550 marks to get seat in government college and it cut off will depend mainly on the .
1. Level of question paper
2. Total no candidates
3. Category of candidate
4. Previous year cut offs
So you must do revision as less time is left for  neet you should revise all the formulas and Biology diagrams and some previous year question  too which will help you to boost your confidence and secure good marks Below is the link for previous years cut off marks
https://medicine.careers360.com/articles/neet-cut-off
Good luck
Hope it helps

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