Passed mine last week - take your time as there are some trick questions! READ THE QUESTIONS VERY CAREFULLY!! Learn to use the whizz wheel and learnt to use it well for all calculations. Be 'very' accurate with all of your measurements and you should be fine. PPL confuser helped me loads and I go 90%
I used some mental arithmetic and calculations scribbled on scrap paper and all was ok.
Good luck - check over all your answers after as well - I amended 4 of mine as I didn't read the question properly!