Here is my personal opinion.
If you start with the passage you get an idea of the concept but also potentially waste time reading and paying attention to what you don't need.
If you start with the questions you have no idea of the context of the passage and what to look for when answering.
Here's my approach:
skim the passage, get a gist of what's being said and where. Don't focus too much on details.
Read the questions, see what's being asked for, go back to find the data in the passage, and NOW pay full attention to that part so that you can answer.
This is my personal opinion, you must find what works for you