JRossSter

Nice to see such a helpful response! However in one sense ohai is right...to pass this exam requires hard work and sacrifice of your leisure time.
I am in the same situation (working full time, at least 10 hours a day and often closer to 12). I would suggest trying to give yourself a bit of time out between finishing work and starting study for the evening. Cook dinner, go for a walk, have a shower, whatever - just try to approach your study as fresh as possible.
I have designed my study so I plan on studying 4 nights out of Mon-Fri. That way I have a 'spare' night -- which is normally Friday, but if I'm wrecked from work, I can swap it round and have a night off without getting behind. Also try to make use of other time to study (eg I revise on the train to work each day) so that you're not leaving it all to the evening. Depending on what time you start work, maybe you could get up a bit earlier and do 30mins in the morning - each little bit counts.
Good luck!