Core concept: reading -- Core concept: listening -- Core concept: speaking -- Core concept: writing -- Vocabulary -- Cracking the reading section -- Reading practice drills -- Reading practice answers and explanations -- Cracking the listening section -- Listening practice drills -- Listening practice answers and explanations -- Cracking the speaking section -- Speaking practice drills -- Speaking practice answers and explanations -- Cracking the writing section -- Writing practice drills -- Writing practice answers and explanations -- TOEFL iBT practice test -- Practice test answer key -- Practice test answers and explanations.