You should definitely start with the areas you're most comfortable, allowing yourself more time for the difficult questions.
You don't have to hit the "skip" button to advance to further questions. You can hit the review button and jump to any numbered question.
I suggest picking your desired order, then start practicing just PAT in that order. Be sure to get comfortable with the buttons!
I personally jumped straight to angles (question #31) and finished out all the remaining sections, so hole punching, cube counting, and pattern folding. This left me with key holes and TFE for last and I usually had about 30 min to perform these two sections and review any marked answers!
Best of luck!