A question is only easy if you know the answer
Or if you know that the question is asking or know how to arrive at the answer. FWIW, I found simply memorising all the formulas/equations and conversions a general godsend. There are plenty of shortcuts that I didn't bother with, so long as you can convert metres, feet, miles, nm, km, Newtons, KG, lbs, etc and rearrange the terms of the equations then that must be a good 15% of effort required to pass many of the exams.