A general way i used to work out the 'tough' BDAs was by working out how much was left at the end of the period, and working out expense incurred by subtracting that from value paid. In that way, you can avoid some of the little tricks of VCAA (2007/8 exam is a good example)
Also, the main issue for most people is dates, so when you go through and read a question, make sure to highlight the significant dates that you need. For example, period start/end date, when expense was paid, when expense expires etc. It allows you to quickly draw out the information required, and not get confused by the variety of different dates and months being thrown at you.
Finally, as generally a follow on question from BDAs is profit/loss or cash flow, i liked to write in my new values on the question sheet itself, so that when i referred back to it, i didn't forget any expenses (a problem I had at the start of practice exams). So for example, if wages was 12000, and you needed to make an accrued adjustment of 300, i would cross out 12000 and write 12300 next to it, so that I remembered which value to use.