In upsee exam with a score of 320 , your approximate rank would be around 50,000 as per previous year's trends.
It is very difficult time predict ranks for reserved category.
But don't worry you'll get a good College.
Rank predictor link:-
College predictor link:-
UPSEE (Engineering) College Predictor 2020 - Predict Colleges based on your Rank
UPSEE College Predictor - Know your College Admission Chances Based on your Domicile Status, Caste, Gender, Exam Result & Get your UPSEE Per ...
Hope this helps!!