Hello Aspirant,

You have a high chance to get into SASTRA since you have a good percentile and GPA.Usually the admission there is based on JEE Main percentile as well as 12th board marks.25% weightage is given to JEE Main percentile and remaining 75% is given to 12th percentage.The SASTRA rank will calculated based on these two parameters((JEE Main percentile*0.25)+(12th percentage*0.75)) and you will be called for counselling based  on your merit.For you your GPA will be considered instead of percentage.

For more details regarding the admission procedure 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 refer the link provided below.

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

Hope this helps.

All the best!!!