Something I found quite useful :-
Get a small notebook....say a 24 page A5(or even smaller) size softcover notebook. The object is to make crib notes in this book and the entire subject must be summarised in that 1 book.
The notes should be the kind of stuff that you would want to take on crib notes into the exam with you.....it will be things like formulas, mnemonics, sketches, etc.
Being a small book you can carry it with you virtually everywhere you go. This means that even a 10 minute break at work can be productive. Before you know it, a lot of the stuff will be memorised.
If you don't understand some of the subject matter, then learn the questions. Obviously some subjects you can't do this and but for example you don't need to go in depth into doppler theory because there may only be 3 or 4 possible questions they might ask you. (This is just an example.....I dunno what they still include in the various subjects these days)
It is also usefull to view plotting and navgen as one subject. Apart from the speed and accuracy, in plotting you need to know what to plot and how to work out certain things that are big elements of navgen.
Good luck
KTK