A degree requires dedication, commitment, and passion to accomplish. A
good degree requires all that, plus the motivation to go above and beyond and complete things like work placements.
For me personally, when I found things less enjoyable, I found myself unable to muster up any of the above and therefore would less well academically in those subject areas. I do a degree in physics, but for the life of me I cannot find optics interesting and therefore found that my grade for that module was not up to my standards. Purely anecdotally, I found this to be the case amongst my friends as well, and the people that were the first drop out of the course were the ones who did not enjoy their topics.
Are you asking because you're trying to choose a path in uni? If so, know you'll get plenty of areas to flex your math prowess in physics (the first two years you'll share maths classes with maths students oftentimes--at least at UHerts) and your ease in maths will pay off in physics, for sure.
Check out the modules in the second, third years of degrees in order to get a better idea of what the difference between two are. Eg.
maths and
physics at University of Hertfordshire.