Well you have a good score in class 12th but your jee main score is low for Sastra University. Sastra University generate it's own merit list based in your class 12th marks and jee main score and give admissions based on that merit list only so it is difficult to tell about the cutoffs of Sastra. However based on previous year records I can predict that with these scores you can get admission in the University but you can't get the core branches. Aa their cutoffs are high.

Thank you.

Hope it helps.