Yes, I use a similar system of remembering numbers. Learnt it back in 1990. Noticed an interesting side effect too. While I didn't deliberately set out to memorise the chart of accounts (they changed the codes so often) I found I was memorising them anyway.
Anyway check out the web site I posted under "If you hate mind map... " there are a variety of note taking tecniques there. As well as advise how to prepare yourself for oral exams can be found there.
Good luck
Alex
