It annoys me when I am approached by a student who constantly changes education centers. When you ask him or her about where they have studied, they tell you a thousand places they have been to and even tell bad things about each. They go on to tell you how you have pixie dust, a magic formula, or some secret book that none but you know about. They expect you to tell you that one book that they should study, which helps them get an 8.0 or 9.0. They are very persistent. They always are in search of that one book they should get hold of. When you tell them that there is no such book, they will be upset with you for not disclosing the name of the book that you earnestly guard. More often than not, these people are just "book collectors". They keep hoarding books, one after another, never finishing one. They are in search of that one great book, which they will never ever find. These people have substituted learning for collecting.

So, please don't be that student who keeps looking for the best teacher. There is no such person. You should understand it is not about the teacher. It is about your study habits and the number of hours you can put in. Of course, I am not saying the right guidance is not important, but if you don't put in enough hours, even the examiner with the most experience cannot help you. Also, stop looking for the best book. There is no such book. You already have enough books. Again, there are some crappy IELTS books, but if you do a bit of research, you find there are good ones most people use. You can find them online.