Hello  Abhishek,

Congrts for your good percentile and GPA.Yes you have good chances for ECE at SASTRA since you have decent academic credentials.You may apply through stream 1(Both your GPA and percentile will be accounted and the SASTRA rank will be estimated based on these parameters).Your 12th marks will be considered for 75% and the remaining 25% weightage will be for your JEE main percentile.Through stream1 70% of the total seats are filled at SASTRA.You will be called for counselling based on your SASTRA rank on merit.

For detailed information regarding the whole admission process please do refer page 9 in the below link.

https://www.sastra.edu/adm2019/application/App2019_B_Tech_Application.pdf

To know the guidelines to enter the GPA in the online application form do refer the link given below.

https://www.sastra.edu/adm2019/assest/Guideline%20to%20fill%20AP%20Board%20GPA&JEE.pdf

Hope this helps.

All the best!!