Commerce

There are many universities providing this course abroad. This is a 3 year doctorate degree which you can pursue after your post graduation.
Some of them are, University of California San Diego
The University of Melbourne AustraliaThe University of British Columbia Canada
University of Hong Kong Hong Kong

Yes, you can apply for B.Sc. Statistics.

You can join the merchant navy course after 12th class from the commerce stream. Any Class X pass students or higher but from non-Science background can join the Merchant Navy by enrolling for the GP Rating Course. Admissions for the GP Rating Course are done throughout the year. You can join merchant Navy as a crew.

It depends on what were your subjects in 12th standard. If you have done your +2 in science then you acn pursue science otherwise you cannot if you are a commerce student from school.

Yes, you can definitely pursue BCA after your completion of 12th from commerce. There are many reputed colleges in India some of them have their own entrance exam.

For Information Science Paper HSC Commerce, the date is 15 March 2023.

There is a common entrance to get into Delhi University colleges i.e CUET.

Yes, you can do MA in Sociology.

It is not compulsory that a PCM student only do job in IT company, a Commerce student can also do in IZ, But the lots of options are available in PCM as compared to Commerce and Arts.