CFA

It seems that you are confused. Go for CA. If you want to go for a course with a shorter duration of time, then go for MBA.

No, the work experience doesn't matter, you have to apply for level -1.

For CFA:
In the last year of graduation you can give your level 1 but before that you should have a passport and you have to register on the CFA institute's website.

You can pursue CFA from any recognized institutes. As William Carry is a state private university. You can pursue CFA from the following institutes as (a) ICFAI University (b) CFA (USA) through any recognized institutes from CFA (USA). For more details and procedures kindly visit(a)www.cfa.org(b)www.Shiksha.com/CFA.

No. You should have a passport before that you cannot apply.

It's not necessary to have work experience to get into CFA. You need to just have 4 years of study. For further details you can refer www.cfainstitute.org

For 1st level, INR. 36,000 s the registration fee and INR. 42,000 is exam fee.
Level 2: INR. 42,000 only exam fee.
Level 3: INR. 42,000 exam fee
This amount may vary from year to year.
You can check it on www.cfainstitute.org

Visit this site for details about CFA
https://www.cfainstitute.org/en/programs/cfa/exam.

I would recommend to you give your CFA level 1 in June, as it give you 1 year of gap to prepare between the two papers, as level 2 will occur in June the next year.

For CFA level 1 exam, you can start from 3rd year of your B.Com.