Engineer

Automobile designers are industrial designers who use both art and engineering to research and create new car designs. Their designs must ensure the safety of the vehicle and operate within regulatory parameters while still creating a great looking, comfortable product that appeals to consumers.
Step 1: Earn a Bachelor's Degree
Step 2: Build a Portfolio
Step 3: Gain Work Experience
Step 4: Consider a Graduate Degree in Automobile Design

Robotics is best in Germany, USA or Japan. You may choose for master's or integrated p.hd but might need some work experience before that. Another option is an excellent research proposal.

Its all depend on your results. More you get marks, more you get salary.

It should always be your choice.
As far as job opportunities are considered B.Tech would have an upper hand if done from a reputed institute like IIT, NIT, Lovely professional University, SRM university etc.But if you would like to go for Higher studies and you don't want to pursue engineering you can choose B.Sc. . It will be a time consuming process then.

M.E. Environmental Engineering Eligibility
1. B.E./B.Tech. with 60% marks or equivalent CGPA
2. Some of the reputed universities and colleges conduct entrance examination to get admission to the degree course.

You have to appear engineering entrances and take admission in b.tech/b.e. curriculum as per your rank. all the best. Thank you.