If you want to get a decent score for IELTS Reading, it will be useful for you to get familiar with the tasks format of this part and understand what is required from you so you do not spend valuable time trying to understand the task at the real exam.
In order to get a high score for the Reading part you should know the format of the tasks and practise doing them within the time limit. It is important to train to complete all 40 questions in 60 minutes because in the real exam you will not have more time.