hello aspirant,

I would like to tell you that YES, you can take and give NIOS class 12th exam with PCB as the Subject, which will be accepted in the NEET examination, as you will be eligible to give NEET examination. Further, NEET also accepts NIOS class 12th marksheet, so you can also apply this same marksheet in your NEET examination as well.

Yes, You can give NEET exam with the open board marksheet of 12th .

Further, at the time of registration for NEET examination, you can give any of the two marksheets in NEET as both of the two marksheets are valid in NEET examination.

I hope that this will help