Question

To become an astronaut in future what should be my stream in class 11

Answer 1

to become astronaut in future first of all u must have interest in planets, moon, Sun, universe,etc...
and in 11th your streme must be PCM (Phyics, Chemistry,Maths) or PCMB (Physics, Chemistry,Maths Biology)

Answer 2

If you need to persue your dream then go with PCM , this would help you in the future. You can go with aeronautical engineering. The job of astronauts require great skills so work upon it from now itself!you can go with the ISRO from India which promotes such programmes. Try to sharp your skills by space Olympiads.