Dear Ritika let me draw some basic differences between all these courses.

B.Com: bachelor of commerce, this is a conventional course where the student gets theoretical knowledge of commerce mind it, it's more about getting theoretical knowledge than practical.

BMS: is purely for those students who want to learn management of different kinds of business. like for example, problem-solving and other conflicts of your company

BBA: this course will tell you how to start a business or how to administrate a business which is running currently.

Since all the courses are different and have different outcomes I recommend you to choose the one which you feel more like doing.

Dear Ritika,

Its awesome that you are decided about future. MBA can be done after any specilazation depends on which field you are interested in. BBA is best if you are predecided for MBA because it is a master degree of business administration.