The IELTS assesses your ability to use English grammar in the form of four skills: reading, writing, speaking and listening.
Here are some grammar topics that may come up in the IELTS:
Verb Tense: You should be familiar with all of the verb tenses - present simple, present continuous, present perfect, past simple etc.
Articles: You need to use the articles 'a', 'an', 'the' correctly in your writing and speaking.
Nouns and Pronouns: You should be able to use nouns and pronouns correctly.
Conditionals: You need to understand how conditionals work in English and be familiar with all of them.
Adjectives and Adverbs: You should know what adjectives and adverbs are and how they are used.
Prepositions: You must know prepositions and be able to use them in the right way.
Passive Voice: You should be familiar with the passive voice and be able to use it appropriately.
Modal Verbs: You should understand the different kinds of modal verbs and know when to use them.
The IELTS is designed to test both your ability to use grammar correctly as well as understand how it works in different contexts. It is important to be familiar with the topics listed above and review them extensively before taking the IELTS.For more tips and advice, you can check out this article: https://ieltsadvantage.com/7-vital-grammar-tips-for-the-ielts/