BCA

No, you can't. You have to leave B.Com and then start BCA from the 1st year.

Both MCA and MBA are equally good career options. If you are technically oriented then go for MCA. If you are not technically oriented and not good at programming then go for MBA. Long term career opportunities and salary after both post graduation degrees are similar. You can select one among them based on the reputation & placement record of the institute.

I would suggest you to aim for MBA after completing BCA because with BCA + MBA IT, you will have dual specialization in technical and management also. MBA is the best career option with large salary scales.

You have to give entrance and pass it. Then counselling

According to me, O level is a certificate course and BCA is a degree. I would suggest you to go with BCA and do part time O level certificate course.

Yes it is mandatory as per the new rules. Earlier IP University was allowing it but from this session it is compulsory and if you have maths in +2 then you will hardly face any problem in BCA because it has majority of what we learnt in +2 mathematics.

IITs and NITs do not offer degree course in BCA.

BCA is a basic graduation degree with which you can get entry level jobs in small and medium IT firms. You will have to do MCA for a meaning IT career. However, B.Tech graduation can have a good career. Therefore, it is recommended that you prefer B.Tech over BCA.

Hi,
IITM is one of the best colleges in IP. IITM has well qualified and experienced faculty to deliver and carry out the pedagogy with 13 PhD holders, 15 UGC-Net qualified, 22 M.Tech, 14 M.Phil and 17 pursuing PhD. For BCA, IITM is a well reputed college under GGSIPU where BCA students are places in top companies like TCS, WIPRO, IBM, etc. This college has good infrastructure and is good in terms of facilities of servers and computers for the students.
For more details click here: - www.iitmipu.ac.in