As we all know, IELTS is jointly managed by the Foreign Language Examination Department of the Cambridge University Examinations Committee, the British Council and IDP Education Group. This is an English proficiency test for those who intend to study, work or settle in English-speaking countries. There is still a big gap between him and the English we learned in high school and even in college. You can do several sets of real questions and test how many points you can get.
For the teaching materials, you can have the following as a reference:
Vocabulary: the core vocabulary of IELTS in Cambridge is exquisite and concise, and the root of IELTS vocabulary+associative memory method.
Grammar: A Reference Manual for English Reading
Listening: The True Classics of IELTS Listening Test Site in Cambridge
Reading: intensive reading of IELTS grammar in Cambridge.
Spoken English: Breaking through IELTS Speaking in Ten Days
Writing: Teach you IELTS writing by hand.