Hello Aspirant,

See if you have taken admission in SASTRA university but you are not comfortable with it so you can withdraw your admission from there and your fee will be refunded as per the government's decision which states that if any student is not comfortable with his/her college he/she can withdraw the admission and fee will be refunded but there might be some deduction of admission charges and other processing charges from the fee you have paid. Time cannot be predicted because it depends upon the formalities of college which varies from college to college.

Now, according to the marks you have mentioned in the question your percentile would lies in the range of 99.31-99.51 and your rank is supposed to be in the range of 4377-6027. On the basis of this rank you can get very good NITs.

You can use JEE-Main College Predictor to predict the most convenient college according to your percentile :-

I hope this information helps you.

Good Luck!!