When i took the course with my company sponsoring me, 9 out of 10 of us passed the exam, we couldn't believe it because it was suppose to be around 30% pass rate.
I would say to get VERY familiar with all forms of testing on ALL circuits i.e radials and rings, lighting and sockets and take it from there. Be sure to be very clear when writing your answers.
Especially when explaining a test. Ensure that you get ALL parts correct in order, because if u miss one part you will not get marked any further for tht question.
REMEBER:
Ask permission to isolate first!
Safely Isolate and lock off! (Prove, Test, Prove)
Many people forget those two at the beginnign therefore get 0 marks for whole question.
Hope I have helped.
Matt