Degree's do not give any advantage over other applicants. The only benefit would be gaining further "life experience", there's a few other threads going on about whether going to uni is benificial in the aviation industry, perhaps take a read and see what your opinion is.
I can safely say however, CTC do not give any sort of biase towards degree candidates. If you can prove you are what they are looking for, then they do not care about what qualifications you have (assuming you have the application minimum). If you believe that you have already done enough outside of school, such as sporting activities, leadership and teamworking examples, and a particular interest in aviation, just go for it while you're young.