Hello

B.com banking is 3 year course . Student eligible after 12th in commerce.

Some of the  colleges offer b.com banking :

AKIs poorna college of Arts , science and commerce. -pune

Jain university- Bangalore

K.J somiya college of arts and commerce- Mumbai

K.P.B hindija college  of arts and commerce- Mumbai .

The average fees of this college were around 15k to 30k.

Feel free to ask

Good Luck...