Hi Vasu

For getting admission in SASTRA University your jee main must be cleared .70% of the seats for B.tech are filled according to marks scored in JEE mains and 30% are filled on the basis of marks scored in +2 merit basis.

And admissions are offered acc to 

JEEmain marks*0.75+ twelth marks*0.25

Total marks 650.

Moreover, 20% seats are reserved for students of Trichy and Thanjavur districts.30% seats are for Tamil Nadu students. Rest 50% are for other states.So, all these factors decide your admission in SASTRA University. You can comment me with more information about yourself.

Hope you get your dream college.wish you luck for the future.