I want to do AME course but for graduation/degree, I must do B.Sc in aviation. Shall I do both things from different college at one time?

The government has now approved AME as a graduation degree course apart from the license issued by DGCA. So you can enrol for B.Sc. AME and after completion of the same you will get a B.Sc. Degree + AME License from DGCA. In this way, you will also become a graduate and get a license.