Counselling is done on the basis of rank you secure in UPESEAT and after that when you report for counselling you are ranked according to your PCM percentage.

Various cut-off in top branches you can expect are:
APE GAS-near about 6000
ADE-near about 9000
CHEMICAL-near about 6500

This is an approx rank. You can consider the above as per previous records.

You can check UPES btech selection process here .

Good luck.