Hello Viji,

Yes,you can. 87% is a good score and SASTRA expects the applicants to Get a good score in JEE as well. University may combine the +2 and Jee score and Mark a ranking for all applicants , based on that they 'll call for counseling and still there is a possibility you can get placed in Third round, which is open counseling (last year open counseling wasn't there). My friend got placed with 87.25% and 20 JEE in open counseling two years ago. my intuition says there is more possibility for you. but I'm not sure whether main streams like Mech, CSC, ECE, EEE will be available if you have moved for open counseling, that 'll be filled with first two counsellings...Finally yes, you can get a seat.

All the Best Bro!!