Automobile Engineering

You have to appear in GATE entrance exam to pursue M.Tech in automotive engineering from a reputed institute.

Hi Vijay,
It entirely depends on your career plans, you can choose to pursue your Bachelors degree in the same. Doing a Bachelors degree will open up the doors and enhance prospects such as job, or even if you want to do Masters degree. You should choose the stream as per your education background, interests and future plans.

Hi, coming from a BMS background you can look for automotive management programs such as a PG Diploma or M.Sc in automotive management or automotive marketing and management etc. A few competitive programs would require GMAT or GRE scores particularly in countries like USA, Germany and Canada. Australia is a good option too. Check TAFE institutes. A few examples here:
https://www.chisholm.edu.au/courses/diploma/automotive-management-international
https://www.ebs.edu/en/study-course/master-in-automotive-management-msc-full-time
Alternatively, gain a few years of work experience and apply for an MBA.

You need to pursue Masters in automobile engineering. Either, you can try for MS/M.Tech. You can look for any job roles related to IT in automobile industry, and then make an internal transition.

Eligibility criteria for the majority of examinations in UPSC or MPSC is graduation degree. You are not eligible for UPSC or MPSC exams as Diploma in automobile engineering is not equivalent to graduation degree.

Lot of engineering colleges have lateral entry admission provision for Diploma holder in engineering. You can seek direct admission in 2nd year of engineering in universities such as Manipal University etc.