Question bank! All you need to pass the exams.
I know it is not the best way to learn the fundamentals but to pass the exams it is the best way. Go through every question, the ones you are unsure about or get wrong write down the question number. Once you have gone through them once go through the ones you wrote the numbers down for and again the ones you are unsure about or get wrong write the numbers down.
Do that over and over untill you know the answers for them all. You will then do well in the exams. I got 95% average using that method. Learn the forumula for gen nav as easier than learning the questions.
Again I know it is not a good way to learn but it is the best way to make sure you pass the exams. The question bank is very accurate.