There are 4 Types of Errors
- You use the wrong word or phrase.
- You use an incorrect collocation.
- You spell a word incorrectly.
- You form a word incorrectly.
How to Improve your Vocabulary
- Read as much as you can, read things from different topics, written by different people, from different sources.
- Learn vocabulary in phrases, collocations, and sentences. Learning a word in context is always more effective than trying to learn individual words.
- Write practice answers and get feedback from a professional teacher.
- Track and review your vocabulary errors.
- You need time - don't waste it memorizing lists of "Essential or Advanced IELTS Vocabulary" as you will not get a higher score using vocabulary that you don't know how to use precisely.