All India Sainik school entrance gives admission to the students in Sainik Schools all over India in class 6 and class 9.

Now for class 6 the age limit is 10-12 years of age on March 31,2021. Now considering the date of birth you have provided, you are over aged(12 years 7months 16days ) to be eligible for the course as per the sainik school entrance norms. Thus you aren't eligible for class 6.

Now if you are wiling to take admission in class 9 then the age limit as per the AISSEE is that the aspirant must be in a age range of 13-15 years on March31 ,2021. But as per your DOB you are  under aged for the course (12 years 7 months 16 days ). Thus if you wish to take admission then you will be eligible for AISSEE 2022.

To know more about AISSEE visit the link below:

https://school.careers360.com/articles/sainik-school-eligibility-criteria

I hope this answer helps. All the very best for your future endeavors!