Full Time

Hello,
I am assuming by open you mean MBA through correspondence.
The difference as the name suggests is in the mode of study, both are designed for different sections of people and both are relevant looking at the cause for which MBA is being done
Regular courses are classroom session courses where students have to attend classes; this is nothing but full-time MBA which requires your complete commitment for two years. This is the most preferred by recruiters and organisations.
Distance/correspondence courses are more about the self study where the study material is sent to the student and they have to understand and learn it on their own. The main advantage of this is fees is low as compared to executive and full time. In distance MBA, you'll have classes once or twice during the weekends, and you'll have exams twice a year.
Regular MBA is much better without any second thought-if you have an option to consider and your situation allows to.
The exposure that you get in any regular classroom, the interaction with the faculty members, the networking with your peers and colleagues is unmatched.Correspondence will never be able to fetch you even a small percentage of this. The regular classrooms groom a character and add value to one's personality besides just the curriculum.
Also, when it comes to the realization of these degrees, a regular course is always valued and preferred over a correspondence, whether you seek a work opportunity or a higher degree. Further, most of the organizations, while employing clearly states in their eligibility criteria that the candidate should be a regular MBA/PGDM and no correspondence is considered.
Good luck.

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.