You must opt for Physics, Chemistry and Maths in 11th class if you want to become an Aeronautical Engineer in future.

Also you have to try and get very good marks in 10+2 because from this year the 12th marks will be counted during admission into colleges along with the marks in the entrance examination

JEE is conducted for 10+2 passed students who want to get admission into various Engineering courses in top Engineering colleges of India.

The paper is an objective type test in which the questions will be from Physics, Chemistry and Maths. Those who score good will get a good rank and will have greated chance of getting admission into a top Engineering college.

So get admission into a goo school with PCM stream and study well for the entrance exam.

Good luck