Dear Neeraj,

Definitely you can start preparing for the AFCAT entrance at any age or class and there is no boundation of the board. Any student from any recognised board can give any entrance exam.

Eligibility

• Candidate age must be between 20 to 24 and only unmarried males and females are allowed.
• Minimum 60% in your 12th board with maths and physics as a compulsory subject.
• For the flying branch you need to complete your graduation in BE/B.tech course with minimum 60% course.
• And for ground duty you just need to complete your graduation from any stream with minimum 60% marks.

Moreover you can go through with this link to know each and every detail.

https://competition.careers360.com/articles/afcat-eligibility-criteria

Good Luck :)