Unfortunately, you are not eligible for the AISSEE 2025 for Class 6.

Eligibility under the AISSEE 2025 Class 6 Admission by the Sainik School Society
A child seeking admission into class VI must be between 10 and 12 years old as of March 31, 2025. Your child was born on June 15, 2011, which makes them 14 years of age as of March 31, 2025, making them above the age bar.

Even if you are not qualified for AISSEE 2025, there are other good educational options that you can choose. Instead, you can seek out other schools or educational centers in consonance with your interests and capacities.

https://school.careers360.com/articles/sainik-school-admission