i do also have quite a 'time demanding' job, being a fuel tanker lorry drive
Not wishing to degrade your road safety, but presumably you listen to music / radio whilst driving.
The solution may be to record your own revision notes on cassette / CD / MP3, and play them in the background whilst driving.
Of course you'll regularly miss bits of your notes whilst driving, but played enough, it'll all sink in well.
I've used this strategy at various points in my life where I've needed to memorise a lot of material for exams. It works, particularly if you spend a lot of time on the road.
G