Should we read question first or passage first in reading comprehension section?

Reading questions first will result in a bias towards a topic that you have read in the questions but for answering the questions correctly you should be able to understand the whole passage first. That's why I recommend reading the passage first.

I will suggest you go through the questions first, don't see the options. by that, you will get a bit familiar with the particular words they are taking from the passages. so it will be easy to find them next time.