Hello,
It's a very long process. First of all if your son doesn't want to appear for 12th from CBSE board then you should immediately contact his school so that they do his Registration for 12th, in case your son is already registered then talk to concerned authorities to cancel hia Registration.
Once you do that, you are going to need some important documents to take admission in State board School or Junior College. The documents are-
1. School Leaving certificate or Migration Certificate
2. Character Certificate
3. Provisional Certificate (In case if school was state board School)
4. Marksheet of 10th
5. Passing Certificate of 10th.
Ask back all the documents from the school (in which your son has taken Admission in 11th). In case they refuse to give the documents go to the school from which your son passed 10th and ask them issue the duplicate documents. Remember except of Original Marksheet and Original Passing Certificate, School can issue all the other documents but you will have to bear the charges for the same.
Get the information that whether Admission for session 2021-2023 has been started in your respective State board or not. But keep all the aforementioned documents ready for use.
Good Luck.
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