Hello,

You have to score atleast 80% of total marks. This will make your admission sure. It may or may not be in your domicile but you will get an admission for sure. Reservation factor for OBC is not high. Your categorical rank won't be low as it does in other categories. SO you have to study hard and try improve your performance.

You can appear mock tests to check where you stand and where is your weak point. The only solution is how much you practice and how you solve a question to get an accurate answer.

Hope it helps!