Hello,

Changing your stream from Science (PCM) to Commerce after CBSE registration requires special approval. While school authorities generally handle stream selection, CBSE may consider such requests if valid reasons are provided. Write an application to your school principal explaining your reason for the change, attaching proof of your research or requirements. If the school denies it, you can escalate the matter by writing directly to CBSE through their regional office, providing the registration details, reasons for the change, and supporting documents.

https://school.careers360.com/boards/cbse/cbse-subject-change-procedure

While CBSE does allow for some subject changes in certain situations, directly changing your stream from Science (PCM) to Commerce after registration is generally not possible, and your school authorities are likely correct. To explore your options, you should still contact your school principal and inquire about any internal procedures they might have for such a request, even if the chances are slim.you should tell reasonable reason.

it's difficult to change streams after registration because CBSE usually does not permit major stream changes after registration as it disrupts the academic schedule and can create complications with internal assessments and Schools need to manage class sizes and subject combinations, making late changes difficult.

If your current school is inflexible, check if another school within your area might be willing to accept you in the Commerce stream.

GOOD LUCK!!