I am in 12th standard and very interested in making woorkin car model and many. which engineering should I do between electronic/automobile

Since your major interest is into Manufacturing domain, the best suitabke Engineering specialized course is Production or Automobiles Engineering which is fully niche and specialized into Manufacturing and Production aspects.

Both have some lucrative opportunities into roles like Core manufacturing, Purchase and Logistics, Strategic Planning, Marketing, Etc.

Some core roles offered are into service and maintenance, Research design Planning, Field supervision, etc. With major Automobile and Aircraft firmsin India due to 'Make In India' program by Government of India.

Automobiles Engineering has very good scope with major Automobile companies set to open manufacturing hubs in India with FDI sector opened up.
Electronics Engineering is more into Chip manufacturing with Handset gear makers and hence, it should not be preferred for you.

To get into top IITs and NITs, JEE mains and Advanced is must to be appeared.

Some of best colleges lole IITs , NITs, GfTIs for this Specialization have been given below.


https://www.google.co.in/amp/s/engineering.careers360.com/automobile-engineering-1%3famp

You should join mechanical engineering

Mechanical engineering

U can choose automobile and take up an specialisation in it :)