IELTS for Success describes the four modules of the IELTS test, and contain lots of practice tests for each one. The book aims to raise your score from 7 to 9, which is much more difficult to do. Only knowledge of the IELTS test can do this. The book tells you the marking criteria and the style of writing the examiners are looking for—after which, native English speakers can achieve a band 9 score.
IELTS for Success is the best IELTS book that’s aimed at native speakers. It gives you “knowledge of the test” without the mid-level English practice.