Diploma

Passing 10+2 with the stream as commerce, one can only pursue a course which requires minimum eligibility as a 10+2 in commerce. You cannot pursue B.Tech or Diploma, you can only pursue this if you passed 10+2 with physics, chemistry, and math as a subject, or you can ask the concerned college or university who is offering this course on the basis of 10+2 with commerce as a stream.

Yes, there are Diploma courses available. Mention your Stream or in which field you want to go.

Other than Bachelor's Degree, there are many Diploma Management courses are available after class 12th:
I have listed some Diploma management courses below:-
>Diploma in Hotel Management. >Diploma in Marketing and advertising. >Diploma in event management. >Diploma in travel and tourism management. >Diploma in Retail management.

All you need is a one-year specialised course. A one-year Graduate Marine Engineering (GME) course after mechanical engineering would give students the licence to enter merchant navy. This one-year GME course is all you need to become a marine engineer after doing mechanical engineering.

10th pass is the eligibility for the diploma.