If you are a school student and while generating your APAAR ID you received the message "School students may contact their respective institution for registration" , it simply means that the APAAR ID for school students is not generated individually by students. Instead, the process is managed by your school authorities through their DigiLocker/official portal.

So, you should contact your school administration, class teacher, or principal and request them to complete the registration on your behalf. Once your school uploads your details in the system, your APAAR ID will be created, and you will be able to access it through your DigiLocker account.