Dear Aaron , firstly thank you for refering careers360.

The thing is you should be with the stream of PCM. 

Then pass the entrance exam of IIT , JEE.

Then pursue your gradution in B.Tech .

Then pass the entrance exam CEED- common admission test for PG course in design held by IIt's.

Then pursue M.Des .

Finally the goal of automoble designer .

All the best !!