Hi,

No, you can't.

As you have mentioned, you are from PCM. That means you have studied maths in your high school, and now you are willing to go for Biology paper as well, but this can't be possible if you have not biology subject. The only chance will be when you have PCMB as well, then you can give Biology paper in CUET.

But you can go for humanities using maths as your advantage, you can go for subjects like Economics honours, which have bright future options, and where you can use your maths skills well. You may even consider psychology, but the competition out there is too tough.

Competition for jobs in humanities is way too higher than that in STEM. So just sit and think and go for courses which will help you grow as a person and as well as professional.

Hope this helps.

Good luck.