Hi,
I want to check should i read the passage first and then jump on to questions, or should I start directly with questions?
I think you can do either, but we generally teach reading first, questions second.
Maybe @gregmat can confirm if its different for TOEFL than GRE
At the very minimum, you want to get a main idea of each paragraph before moving on to the questions, in my opinion.
ideally how much time one should spend on skimming out of 17-18 mins on one passage? @gregmat