Colleges in Mumbai

No, it is not necessary. You can get admission in B.Com finance with maths in 12th.

Hi,
You would require around 140-160/200 in NATA 2019 and 250-260/290 in JEE Paper 2 to secure a seat in Sir JJ College Mumbai or SPA - Delhi.

Yes, on that basis of CET you can take admission in MCA
K.J Somaiya College.

You should try for a private college in Mumbai. Your personality is very good.

You can't do a BA in 1 year and this not a legal way to get a degree. Yes, Institute of distance and open learning provides distance education mode. If you are looking for a one-year bachelor course then look for the foreign university as they offer a one-year bachelor degree. Although you shouldn't look for a one-year degree course foreign universities are the option you have. You can also look for below options also:-
1. Amity University
2. Annamalai University
3. Mewar University
4. Suresh Gyan Vihar University
5. JIMS
6. NMIMS
Regards

Eligibility Criteria for admission -
Qualification: 12th
Additional Details: Mandatory Subject : English
Admission Process
Register and Apply : Interested candidates can apply online with required information.
Merit Screening: Admission is based on marks obtained in 10+2.

I am attaching a link that will give you all the required information about admission in ICT, Mumbai:
https://www.shiksha.com/university/institute-of-chemical-technology-mumbai-36791/admission.