This document is the introduction to a book about why students fail English language exams. It discusses 12 different types of students who commonly fail exams, including the lazy student, diligent student, know-it-all, class clown, whiner, blamer, and worrier. For each type of student, it provides a quote, motto, and explanation for why they often fail exams. It aims to help students avoid failure by recognizing weaknesses and providing advice, such as putting in more effort, focusing on important concepts rather than details, accepting personal responsibility, and reducing worrying. The book is based on the author's 15 years of teaching experience helping hundreds of students succeed on English exams.