I absolutely disagree with " Focus on the text first" point, instead of reading the questions first. Reading the questions first (in 1st and 2d sections) you have to keep a small idea in mind, looking for its answer in the text. While reading the text first - you have to keep in mind a much bigger piece of information and then match it to the question. While, in the 3d section the questions and the answers are messed up, so here I'd recommend to read the paragraphs first and then looking for the right answer in the questions. Traditionally, there are some names for the headings, and here you need to understand the whole idea of a paragraph to match it correctly. This is a very strange recommendation and I have never seen it in IELTS prep books.

Over time, I have improved in the TRUE/FALSE/NOT GIVEN and YES/NO/NOT GIVEN questions. I won't say I am perfect yet. This is my suggestion. Think like this:

Is any information at all about the question statement given in the passage or not?

If it is, then the final answer will either be TRUE/YES or FALSE/NO. Then check further. If the question text agrees with the passage then the final answer is TRUE/YES, but if not, then it is FALSE/NO.

If no information about the question text is found in the passage, then the answer is simply NOT GIVEN.

But something else it tricky because IELTS likes to play a lot with words. You need to slow down and read this part of the passage carefully. You cannot skim or scan this part because you may miss the information or the point and just assume, especially when you are running out of time. Ensure you create more time for this question type. It is usually very tricky. And that's the trap!