Yes, of course you can take admission in class 12th in the Dummy / Non Attending school. It is done very easily, there is nothing to worry about it.
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Hello Student...

Dummy schools are ordinary schools that have partnered with coaching centres to lessen student burden and give them more time to study for admission tests. There is really little need to send your child to these schools.

Dummy school admission for class 12th CBSE Board is only available through Patrachar Vidyalaya, CBSE Private or Nios Open School Board for National Institute of Open Schooling.

However, you must have an 11th grade school leaving certificate.

I hope this information helps.

Regards.