Hi,
Kudos to you for working as a carer. 🙂
What you've said is all fine so long as you have the right qualifications already to satisfy the entry requirements (i.e. you're not using these NVQs as a way to gain entry on to the qualification).
What I would caution against is your time commitments. If you're doing NVQs as part of your caring job, then you are absolutely allowed to do that, but would this eat into some pharmacology studying time?
If you feel it would not impact, then from an "if you're allowed to" perspective. You are 🙂
Good luck!