I was a house tutor during my college life and that really helped in reducing the financial burden on my father. My father didn't need to send me money on a monthly basis unless there was a need for a big amount.
I have seen the misuse of "students discount" in the public buses in Dhaka City. Students from some renowned colleges used to misbehave with the bus staffs.
Another good option, specially in Bangladesh, is to join in student politics. Not just any part,it must be the student wings of the ruling party. It’s a very profitable way of making good cash.