Guess the short answer is that it isn't easy.
Needs iron will, discipline and focus.
Set time aside but leave time for yourself and the other things in life.
Cut out the crap that you do rather than the high value things, so keep up sport/ gym/ not too heavy nights out and chop trash TV/ heavy nights and general time wasting.
That will buy you a lot of time.
Do some study if you have to travel.
Set targets (not too big) and hit them. Then you progress.
Take your time and work at your pace (till you take the first exams, when the clock starts...).
My (personal) advice (works for me but not everybody), is do the study, do the course, then have a gap before the exam to absorb what you learned in the 2 weeker before heading for the big room.
The exam feedback for the 'learnable' subjects, if you note it down lasts for ever and you can revise from anytime. The 'subjects you need to know' like Gen Nav/ Flt Plng/ Met you need to be hot on so leave/ plan/ make time in the run up to get hot.
The exam feedback I used from GTS gave me on average 65% of the questions in the papers from the 'learnables'. Personally, I needed the time from the course to the exam to absorb the techniques etc and get hot.
Hope that helps (NB, my views, worked, so please nobody say I'm wrong for me)