The diagrams show how the layout of a school library changed. Map comparison is a very common question type in IELTS Task 1 Writing section. Therefore, you should know well how to produce a task 1 map band 9 writing. And, if you want to learn effectively how to do this, you should read quite a number of task 1 band 9 map responses. Reading it will help you understand how the task 1 map 9 band answers are structured. This blog is full of these materials for free, prepared by actual examiners!!