In the reading section of IELTS whether its an academic module or general training one must know how to tackle the question within the time limit.
Therefore, it is not necessary to read a whole lengthy passage. First, read the topic and than the topic sentence and last sentence of the first paragraph. Topic sentence is the first sentence of any paragraph which introduces you about the given information. Now you have some idea about the passage; than go to the questions and read them without any panic.
Than read all the topic sentences and last sentences of all the paragraphs.You than have a clear mental impression that what is the whole article which will help you to locate the required answer.