As per Sastra seats will be allotted based on

Stream1 counselling :Based on JEE Mains score and +2 marks. If you have a good JEE Mains score then it would be easy to get a seat in the course that you wish to purse.

Stream2 counselling :It is purely based on you +2 marks and the seats that are vacant in stream1 counselling are allotted to you so it becomes narrow here to get the branch that you wish to pursue.