El S, why do you ask?
I see a recent post
I haven't yet applied to either the Navy or RAF (I'm going to wait until I finish this year in uni).
You were asking about asthma a year ago, have you resolved that issue?
Really, given your age, you should apply for both RAF and RN
NOW! and let them sort out whether you are medically suitable. When you know the results you will know how essential a good result in your law studies will be.