See what I know is that in shastra University admission is taken in two streams . Stream 1 and 2. In stream 1 if one has more than 150 marks in JEE mains then it would be easier to get admission in it. 

Stream 2 takes admission based in class 12 the percentage . If you are in top 20 ranks in your state then you would easily get admission in SASTRA University. 

All the best.

Thank you.