There are 3 ways to join Indian Airforce with or without NCC -

NDA - Candidates applying for Air Force should pass class 12/HSC in 10+2 pattern of School Education with Physics and Mathematics conducted by a State Education Board or a University. Also, candidates appearing in class 12th are also eligible.

To know all about its eligibility, you can go through the below link -

NDA Eligibility

CDS - Age Limit: 20 to 24 years

Qualification: Degree of a recognised University (with Physics and Mathematics at 10+2 level) or Bachelor of Engineering.

To know all about its eligibility, you can go through the below link -

CDS Eligibility

AFCAT - Applicants should be graduates in the required disciplines and should have at least 60% in all the papers.

Age limit: The minimum age limit for applicants of AFCAT 1 is 20 years and upper age limit depends on the choice of branches and category.

Nationality: Only Indian Nationals can apply for the recruitment process.

Note : As you have 3 choices in front of you so you can decide as per your interest,potenial and eligibility and also mention which cost you are asking for as the application fee is nominal and the training is free.

Good Luck!!!