Hi

To become automobile engineer, one needs to do btech in automobile engineering

But you are from commerce,

And being a commerce student, you are not eligible for Btech and thus can't become automobile engineer .

This is because,

To be eligible for btech, you need to complete 10+2 with Maths, Physics and any one of the following subjects:-

• Chemistry

• Biotechnology

• Biology

• Technical Vocational subject

But being a commerce student, you would not have  studied Physics etc and thus not eligible.

For your reference,

Jee main eligibility criteria is given below which is the most widely accepted entrance for Btech -

---------------------------) Qualification required :- to be eligible  for JEE mains you need 10+2/equivalent qualification from a recognised board.

To get complete  jee main eligibility criteria  go through our page, the link for which is provided below

https://engineering.careers360.com/articles/jee-main-eligibility-criteria

Thank you