Why English Grammar is important?
English Grammar prepares candidate to make progress in all the four skills, reading, writing, listening and speaking. Aspirants usually their progress in speaking and writing mainly, because this is where you will actively use grammar structures to express your ideas.
According to the IELTS Speaking test scoring criteria, 25% of your score is based on 'grammatical range and accuracy'. This refers to number of different grammatical structures that you can use in your speaking, and how frequently you make mistakes.