Choose appropriate reading-test materials. The IELTS website provides sample test materials, and many books of practice tests are available. To understand the structure of the test, read the outline given in the IELTS "Information for Candidates" booklet.
Be aware of the types of answers that the test asks for. These are mainly brief and include selecting multiple-choice alternatives, identifying statements as true or false, matching items, completing texts, labeling diagrams and writing short answers. If your candidates' answers do not follow these patterns, they are most likely incorrect.
Remember that the Academic and the General Training versions of the reading test differ. The former contains three long nonspecialist passages on academic topics, whereas the latter includes several shorter pieces on everyday and work-related topics plus a longer text on a general-interest topic.
Familiarize yourself thoroughly with the test materials that you are marking, and then identify the correct answer for each question before you start marking candidates' answers.
Try to anticipate what mistakes or misunderstandings candidates might make when they read the test materials.
Give one mark for each correct answer. Each reading paper includes 40 questions in total, whether the candidate is taking the Academic or the General Training version.
Make a note of common errors if you are preparing candidates for the IELTS reading test. With this information, you can help them learn from their mistakes and avoid similar problems in future. This preparation can also lead to improved reading skills.