I have made a PPT that contains a lot advice on how to improve your language for IELTS. It most relates to the IELTS Writing Exam, but it could be applied to other parts. Key lessons are avoiding IELTS phrases and upgrading boring or repetitive language.
The Advantages and Disadvantages of Apartment Blocks [IELTS Writing Task 2 Sample Answer]
Why is Your IELTS Grade Lower than Expected?
IELTS Speaking Topic: Childhood
How to Write an IELTS Essay [Task 2]
IELTS Reading Practice: Plastics
Describe a Restaurant [IELTS Speaking Part 2]
Story Structure: IELTS Speaking Part 2
Answering Difficult Questions