Hello,
If you are not a student from Tamil Nadu state, you should have a rank of atleast 636. 
If you are a student from Tamil Nadu state, you should have a rank of atleast 2351. 
It is only possible for us to say the estimated cutoffs but the marks you should be getting totally depends on the toughness of paper and the students appearing for the exam. In general if you have a score of nearly 200 to 220 you can absolutely get the seat. There are good amount of chances for the mark to vary vastly for the next year.
Good Luck!