Remember that the fulltime brushup courses are excellent. They really will prep you for the exams and you will be dreaming of formulae and typical questions in your sleep leading up to the exams.
My point is, concentrate on each progress test and make sure you understand the topic thoroughly, but once its done forget about it. Switch focus to the next topic and dont try and revise previous lessons or memorise facts and formulae. Its a waste of time and energy. Press on through the syllabus.
If you've understood the subject thoroughly, the brushup will bring it together nicely.