i found the human performance subject quite interesting, there are a lot of things i didnt know about the subject
in terms of passing the exam, i would get a copy of the ppl confuser practically everyone ive spoken to has read it, the questions i had were almost exactly as per exam.
regarding the weather ive had at least six lessons cancelled mostly due to poor weather conditions this winter reading the TAFS and METARS will help you.
trying to fit the training around instructor availability and work commitments is real pain but i guess im not the only one with those problems.
good luck and stay focused!!