Hello Aspirant,
Congrats for your good percentile and CGPA.Yes you have a high chance for securing a seat at SASTRA University.The admission there is based on two streams.You may apply through stream1(both your CGPA and percentile will be considered).70% of the seats are filled through stream1.The counselling will be based on the estimated SASTRA rank((JEE main percentile *0.25)+(12th marks*0.75)).For you your cgpa will be considered instead of 12th percentage.
Please visit the below link to more details.
https://www.sastra.edu/adm2019/
Hope this helps.
All the best!!
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