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According to Indian education act-1959 you can not pursue two degrees simultaneously, because it causes extra burden on students(according to law makers).
But after the recommendation of few universities UGC has now granted the permission for students to get enrolled in two degrees(in same or different universities).
But this law has been changed since 2013 permitting its full-n-functional use from 20142015 academic years. So interested students can enroll in two degrees simultaneously whether from the same university or the different. Though there can still be a few hidden points where courses to be chosen might have a rule for forming the pair of courses a student can apply.

Dear Rohit,
If you enter into BBA now you will have to start all over again. In fact you will delay your graduation two years from now. However, if you just try to plan your course of action, than you will come out in flying colours. All you need to do is just analyse as to where are you lagging behind in your studies. Find out which is the subject that is creating problems for you. Once you are done with this join some good private tuition where a subject expert can help you come out of your fear for that subject. Practice it with full focus and devotion. You will find that you have reached in a better position than now. Complete your graduation with the ongoing B.Com and then think about something else. Once you have completed your graduation there will be many opportunities into different areas where you will be able to perform well. So think positive and be focused along with working hard.