I shouldn't worry too much about your spelling,
the British/English spelling is 'qualifies'.
Some of the normal criteria for judging who gets the sword of honour are little things like attendance, excellence in all aspects of the training, an ability to inspire and lead your fellow cadets, a commitment 'over and beyond' what you are told to do, the ability to 'think on your feet', natural leadership qualities and, of course, being properly attired and looking smart at all times. Even off duty behavior is taken into account.
I hope it is judged fairly, IMO, he has had a lot of time off for polo, a couple of charity events and he has been seen drinking till all hours.