Dear aspirant,

I understand that you want to change your stream to PCM. I would suggest that you should talk to your school principal or incharge about your problem. He/She will give you instructions, just follow them. I believe you won't face any problems if you act soon.

I'd also suggest you to submit your stream change request to your incharge or principal as soon as you can to avoid delays or any other problems.

Hope this helps!

Good luck!