You are currently doing your B.Com in Computer application and failed in the second semester. In the middle of an enrolled full time course you cannot change to a different stream, i.e buissness administration.
You will have to decide whether you want to stick to your B.Com or do a BBA.
Why not consider finish your B.Com in computer applications that is a good sector. Once you complete your B.Com, then you can get into a job and enroll for MCA from IGNOU ( the basic eligibility is a bachleor's degree with mathematics at your 12thor graduation).
With your B.Com in Computer applications and a MCA, your options for future growth opens up. You will also be eligible for the GATE exams and then consider a teaching post or a IT job.
If you are keen on business administration, I would suggest focus on B.Com now, complete it and then do your PG in supply chain logistics or a MBA and then work your way up the ladder.
Consider these options, discuss with your teachers and friends and see what would be the best way forward. If you decide that you cannot pursue B.Com Computer applications, then you will have to abandon the course and then go to BBA, this would not look nice on your CV or educational history ( unless you decide to hide this one year).