yes you have decent chances to get into Sastra University.

I'll tell you how the admission in Sastra college is based. 70% of the seats are filled in this manner that I'll enlist below..

Your 12th percentage is 95 and let's assume the topper has 98 percentage.

95*100/98 = 96.94

And your jee percentage is 80.14

Your JEE scores has 25% importance and boards have 75% weigthtage to get into this university.

So as per this..

96.94 * 0.75 + 80.14 * 0.25 = 92.75

This is your final score . AIR (SASTRA) is prepared based on this final score . There is a chance AIR up to 4000.

Refer to the link below for more detailed information..

https://engineering.careers360.com/articles/sastra-btech-admission

Best wishes. Thank you.