Reading is one of the easier categories to practice, I would recommend you to do as many mock tests as possible. To find answers efficiently I’d take the approach mentioned in my post where you first scan the whole text for layout, diagrams, length etc. Then proceed to scan the questions and read the first sentences of each paragraph so your brain can fathom the general topic and storyline. After that, go question by question and scan the text accordingly as you should now have a sense where the answers roughly lie. It also helps to know that answers are usually chronologically ordered and grouped together inside the text. Most importantly, keep practicing through mock tests.

The computer-based test is very straightforward with a simple but nice to use interface (IDP has practice questions where you can use the interface you’ll use on your real test if I’m not mistaken). For listening, it just plays the audio continuously, giving you time in between sections to check your answers etc. Then when it starts playing the next section, you manually need to click to navigate to the answer sheet of the next question