1. You are working as a "Admin Staff" and not working as a "Teacher"
2. Your establishment /School is a "non-aided" school, in Maharashtra.
3. IRRESPECTIVE of the above you as a "employee" ARE entitled to Gratuity and on failure by School to pay gratutity you can contest the same before the local labour commissioner's office and also file a grievance complaint to the ward Education Inspector /officer, regading the school malpractices, alongwith the Audited Balance Sheet of the School Establishment.
Keep Smiling .... Hemant Agarwal