My sister is a student of Narsee Monjee College of Commerce and Economics and according to her, it can be done. But it will definitely be very much difficult for you to handle. The attendance of Narsee Monjee is strict, at least 75% is required. So you will have to attend classes almost every day.

Then the classes are not according to a fixed schedule. They change frequently. You may have a presentation or a project at any time without notice. This will eat up a lot of your time. All these things make doing CA and BAF simultaneously very difficult. But yes it can be done nonetheless. If you can take this and manage classes and office at the same time then go ahead and do it.