Here are 3 tips to help you prepare for IELTS reading:
Materials
First, for test practice I only recommend the official Cambridge IELTS books. These contain real exam papers from previous years, so you can trust that the difficulty level will be accurate. Second, for advice, techniques and quick exercises, use the lessons here on the blog. Finally, read as much English as you can (in newspapers, books, on the Internet etc.) and write new or useful vocabulary in a notebook.
Method
There are just two things that you need to do in the reading test: find and understand. First, you need to find where the answer is in the passage. Then you need to read and understand that part of the passage in order to get the right answer. Look through my lessons here on the blog to find more advice about the "keyword technique". I've also explained the keyword technique in this video and in all of the reading lessons on my video course website.
Improving your score
To improve your score, you need to work on two things: exam technique and your overall knowledge of the English language. With practice, you'll get better at using the "keyword technique" to find answers. However, if you don't understand the passage, you'll find it very hard to get the right answers. To improve your overall language knowledge, read as much English as you can, and write new or useful vocabulary in a notebook.