I don't know if anyone else finds this technique helpful, but it got me through all my ATPL exams.
The second the exam loads, go straight to your highest mark questions. Get them all done, take your time with them, do them accurately. Work backwards until you're just left with the 1 markers. These should be the one's that you either know or you don't, simple case of read the question, click the answer.
I got a fairly even spread of questions in my Nav exam.
Do all of the AFT practice exams, they're gold!
morno