Can someone do an A-level/GCSE along side a degree?

So, I've been wondering this for a while now and it's mostly out of pure curiosity, if I'm completely honest.

Is it possible to do a BA degree and do an A-level(or GCSE) at the same time? and has anyone ever done this and succeed?

Just want a clear answer please.

ofc, why would it be illegal? doesn't make it any less idiotic

Well, you won't be able to do it for free, but if you want to pay for exam entry, tuition (or try and self study to save money, but you will probably need to pay for some resources e.g. textbooks), and for science subjects, the science endorsement...there's nothing to stop you from doing so.

It really seems entirely pointless though - what are you going to gain from a random A-level or GCSE that you can't or won't from your degree? If it's merely to explore an interest you'd be better off making use of your university's library resources to explore that area, and a single A-level or GCSE qualification usually doesn't mean much (the exceptions being GCSE Maths and English Language at grade C or above, which you probably will already have, and in that case you would be retaking rather than taking it as a new subject) to employers (or anyone else).

I might still be able to do I for free due to my age but I understand it wouldn't be cheap either way.
The degree I was planning on doing was Criminology (policing) and the A-level was going to be either Sociology, Psychology or Art and design.
The course content doesn't go into a whole lot of detail at the uni I'm planning on going to.