technique
foz
there arent any really great methods i can think for this task, it is one of those things that u just have to learn...try and look at which ones have the chart convergence on them, and remember where ur equator is...its is a hard task i know, i have been there, but what u will find is that there will only be a few questions in the exam about charts (if your lucky!) and they will be to do with naming where rhumb lines are facing (convex or concave to the equator) and then just some convergence angle questions.
what u will find is that the exam will be heavily based on the use of the CRP 5, so make sure you are up to speed on how to use it and knowing your methods..
good luck
Keeno