Having an excellent economics teacher is not enough, however, having an excellent prep book is!!
After purchasing this book, I have no regrets and can say that this book goes into every detail that is vital for the test and also presents the material in a systematic, clear and consice way with enough examples not to confuse you.
Plus, at the end of each section, there is a small review with all the important notes that are covered in th chapter and there are about 20-22 multiple choice practice questions with detailed answers, explicating each step. Also, there is a free response section which presents questions that can really challenge your mind and provide you with the confidence.