Hello Rishabh,

If you have completed your class 12th with PCM background and also have completed your B.Tech but now you want to do your intermediate again with PCMB Background then it would not be the wise decision although you are eligible for doing so, the reason being is that now after gaining all good qualification you are eligible to move further then why you want to go back and if you again start with PCMB then you will have spend your two years again which is not needed even until and unless you are extremely desirous to make your profession in Medical field. So if you again want to go for PCMB than you have to go with NIOS and your B.Tech certification will not loose it's value, but whenever you will be using your B.Tech degree for any purpose then along with that you have to use your class 12th marksheet of PCM background otherwise with new marksheet of PCMB background you will be considered as invalid candidate.

I hope this information helps you.

Good Luck!!