Hi

There is no such marks which should be sufficient the better you score the better your rank will be and you will get a seat in better university with high placement options.

As for qualifying jee mains, it is the minimum marks required for qualifying the mains and get a chance in jee advanced.  Jee mains cutoff are the marks required for admission in various engineering institutes.

The expected qualifying jee mains cutoff of 2021 is

Common rank list (CRL) - 90 to 95

Gen ews - 70 to 75

Schedule caste ( sc) - 50 to 55

But the more you score the better your chances are in getting good universities with the subject of your choice

Try to score above 85 if possible 90 try 110+ marks  to get NITS like :

Nit rourkela

Nit tiruchirapalli

Nit calicut

Nit nagpur

Nit bhopal

For more information about jee mains visit:

https://www.google.com/amp/s/engineering.careers360.com/exams/jee-main/amp

hope this helps