hi,
see its completely ur own decision that u can manage your regular college with ca preparation or not, and as the sylaabus of bcom is completely included in ca too.. subject wise u wont need any further assistance for bcom studies and excam, just the diff will be that if u go for regular college then u have to give some time to your collge attendancew daily approx 5-6 hrs, bt its manageable nt too tough, and if you are hard working and a regular student then you can easily manage regular college with ca studies,and college life wont return back in future,, so enjoy it with ur studies for ca too..good luck for your future