According to the limited data available, the cut off for GMCH Chandigarh (UR category) is expected to be as follows:

General (Unreserved) category- 637-653

SC- 560

ST- 448

As you can see the cut off for reserved categories is usually less than what it is for the unreserved or general category. Even so, the cut off for UT quota for EWS can be expected to go more than 570 marks. You should still apply for the counselling.which will be conducted by GMCH itself.