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The IELTS test does not include a grammar module; instead, grammar is checked and assessed indirectly in two of the four modules:
Listening: all your answers MUST be grammatically correct…
and you will use your grammar knowledge to get the right answers!
Reading: all your answers MUST be grammatically correct…
and again, grammar helps you get the right answers!
…and grammar is checked and assessed directly in the other two modules:
Writing: answers to the Writing Tasks should be as grammatically correct as possible.
Speaking: responses should be as grammatically correct as possible.
You can see that grammar IS very important in IELTS!