Dear Akhileshwar,

The admission in Sastra University will be on the basis of two streams-

Stream 1:
JEE Main 2019 and normalized 10+2 scores will be taken together for admission under stream 1
The scores of JEE Main will carry 25% weightage and 10+2 scores will carry 75% weightage.
The combined scores will be used to prepare the rank list and candidates will be invited for admission on the basis of the rank list.
70% of seats will be filled under stream 1.
Stream 2:
Candidates will be considered for admission based on their normalised aggregate 10+2 or any equivalent exam scores.
30% of seats will be filled under stream 2.
By this, we can say that If you will get good JEE main rank then only you'll be eligible to enter into Sastra

If you have calculated like this then 90+ score has a good chance to secure a seat in Sastra University.

hope you get an invitation from Sastra University soon.