Hello,

There are mainly 3 types of entries in Air force i.e

1. Flying  2. Technical   3. Ground Duties

If you have just passed 12th then I would Suggest you to go for NDA (just an 10+2 in Science is enough but subject like Physics,Chemistry,Maths is must). But if you are particularly intrested in doing engineering  you can take any stream of your interest. for flying and ground staff duties graduation in science would be sufficient .Apart from this Engineers from any field can join as officers. If you want to go for Technical then engineers are choosen primarily  from Aeronautical/Aerospace ,electronics,electrical ,ComputerScince.As there is no specific engineering stream for joining IAF So you can go for any stream of your choice .

Thanks!

All the Best