A.C
I'm currently in second year at uni studying Anatomy And Physiology after getting ABB in my A-levels. Obviously not the most relevant degree for a wannabe pilot...
I would definitely recommend going to uni, for obvious fun reasons, and the fact that it MAY possibly give you an edge later in life,
As for CTC, the type of degree you do doesn't matter, as they don't specify anything in particular, but the skills you learn from it are..i.e teamwork, interpersonal skills and possibly leadership. The fact that its not related may show that you are a more "three dimensional" person, with other facets to your personality that may make you a more employable person in future.
However, a good idea would be to show continued dedication to aviation (like UAS, flying lessons and summer jobs at airport etc).
Good luck