IELTS reading is really a test of 2 things:
- Can you find the part of the text that contains the answer?
- Do you understand that part of the text?
You need to be able to find the right part of the text quickly. I practise this a lot with my students: we decide which words in the question we need to search for, then we try to locate those words (or words with the same meaning) in the text.
When you have found where the answer is, you need to read that part of the text carefully. Read the sentences before and after the keywords that you found. Then it becomes a test of your vocabulary knowledge: if you don't understand the words that you are reading, it will be difficult to get the right answer.