Hello Aspirant

In CBSE, there is no specific document called SID (School Identity Document). But, some documents will act as a SID for your school under the CBSE Board-

- Your Admit Card issued by the CBSE board will have essential details like the student's name, roll number, exam center, and subject codes.

- Your ID Card issued by the individual school can act as a form of identification within the school premises

- The Digital Locker, a platform provided by CBSE where students can access their marks, certificates, and other academic records digitally in which you can register for a digital locker using your CBSE roll number and other required details can act as a SID too.
Hope this helps