atpl
best way to pass the exams: do the reading, do the work and back it up with the feedback. its impossible not to memorise some of the answers to the feedback questions, but its not advisable to conciously do so - if they decide to change a word or number, the answer you've memorised is likely to be wrong!
mass and balance, gen nav and flight planning are definitely ones where you have to know the methodology to answer the questions.
However you approach it, its hard work but well worth it once they're over!
good luck