Full Time B.Com

Hi Vasanth!
It is up to you. Madras University is a reputed university and I don't see any reason why you shouldn't pursue B.Com from there.

In Open university.

Honors is an upgraded version of B.Com and every upgraded version is always better than the previous one. Also there is a beneficial factor related to it. That's when you go for MBA as your post-graduation degree at the time of admission process you will be given more preference over the other ones.

Minimum 50% is required to get admission in this field.

Now-a-days, a lot of banking exams are conducted by various institutions. You can go for Bank PO or IBPS exams and with work experience, you can also get the post of a bank manager.

The minimum eligibility for admission 10+2 pass.

It would be better, if you go for CA after graduation, rather than doing it after Masters. You may parallelly do M.Com while doing CA. Thanks and All the best.