Is there any concession in management quota for different categories or is it equal for all in Sinhgad College?

No, there is no concession for any person who is applying through management quota, because there is a huge amount which is profit for the College to earn these seats. All the best.

If you cannot take admission through normal process, then only you have an option for management quota and they are not bound to give any concession so do not expect either. You have to pay the fee, determined by the institute and it remains same for all students irrespective of caste.