Class 12-science

Dear,
Firstly, you need to check with your school and rules too for change of your stream in class 12th and consult with school counsellor and speak to your school teachers too regarding this, take the decision accordingly.
Don't take decision like this.
All the best.

You can choose among Chemistry, Zoology or Botony subjects to do B.Sc Hons after 12th board and then do M.Sc in same subject on completion of graduation degree. You can register for PhD after M.Sc. Few universities allows exceptional students to do integrated PhD after B.Sc Honors also.

Can I know about your stream?

Hi Prashant,
This information will be found on the test papers and sample papers. You can also check the website of your education board. Contact your school and seniors too.

The majority of B-schools offer MBA degree course after graduation. But some universities offer integrated BBA+MBA degree after 10+2. You may evaluate MBA dual degree from Amity University. IIM-Indore also offers 5 years integrated management programme.

Many courses are available after completing class 12th with PCM.
B.Tech/BE in your interested branch
B.Arch
B.Sc with any science subject
BCA
B.Pharm
B.Agriculture
Dairy technology
Hotel management

No, it's not possible because it is a required criteria to pass in PCM with 60% marks. You may give class 12th exams again or go for any other options.

Yes, you can get admission in BBA after completing your class 12th. You have to give entrance exams for BBA after which you can take admission in colleges for BBA. Any stream student can pursue this course.

Yes, you can very well go for BA after science in 12th. Check the below link for colleges offering BBA-
https://www.shiksha.com/bba/colleges/bba-colleges-delhi-ncr