SMEAT

On the basis of your JEE Main percentile admission in NIT-W is very tough up to 7th rounds in your category. However, wait till the completion of special rounds.

Yes, with this percentile you will definitely get seat in SASTRA University.
Best of luck.

Hello, you have very good percentile at above 80, as well as a good CGPA of 9.88 in your boards. 70% of the seats in this Deemed to be university are filled up according to the ranking in JEE Mains along with weightage for your marks obtained in the board & remaining 30% seats are filled up based only on the marks obtained in the board examination. I think you stand a very good chance keeping in mind your CGPA and also your percentile. However to help you I am attaching a link that will predict college for you based on your percentile.
https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor
Best wishes to you.

According to your class 12th Science percentage, there may be chances of getting an admission for B.Sc in Agriculture seat in Coimbatore. B.Sc in Agriculture is a degree program after completing class 12th with Physics, Chemistry , Biology.