Yes, a valid school identity card, like your Class 11 school ID, is an acceptable document for Aadhaar enrollment, especially for children and minors.

The Unique Identification Authority of India (UIDAI), which oversees Aadhaar, explicitly lists a "School Identity card/ Photo ID issued by Recognized Educational Institution (during study course time i.e. while on the rolls only)" as a valid proof of identity.

When applying for an Aadhaar card for children between 5 and 15 years old, a school ID card can serve as proof of identity.

To be accepted, the school ID card must contain your name and photograph.

Remember to bring the original school ID to the Aadhaar enrolment center as photocopies are not accepted. The original documents will be scanned and returned to you.

Therefore, your Class 11 school ID, containing your name, school name, and photo, is a viable proof of identity for Aadhaar purposes.