Realistically 1 hour per week is probably a half day, but it should be affordable, but you need some break from study or you'll go mad.
Bin something else - stop watching TV, playing video games, going out with your friends - all of those are less important in the long run than either study or flying (but study must be more important in the short term).
Also have a chat with somebody experienced in such things about planning your study life, in my experience most people behind on full-time studies need to sort out their planning, organisation and study methods rather than find more time per-ce.
And best of luck with your A levels.
G