IELTS exam Writing Assessment

How does the examiner assess Grammar?

Choose the correct tenses
Using tenses appropriately.  Remember these IELTS exam essays are about general situations so most of the time you will find you are using present simple tense.  However, if you are making predictions then future tenses or structures are necessary.  If you refer to the past then past tenses apply.  If you are using conditional structures then different tenses are used according to which structure you choose.

Use correct punctuation
Don't ignore this area - examiners are checking.  So appropriate use of capital letters, commas, full stops, semi-colons and apostrophes apply.

Use correct prepositions
This is an area students find difficult.  Prepositions of time and place, as well as phrasal verbs and other verb preposition structures will be checked.

Use a variety of complex and simple structures
Examiners mark IELTS exam essays according to the variety and accuracy of grammar. 
So if you choose to only use simple structures you will limit your grammar result to 5.  However, if you experiment with complex sentence structures, including passive, relative clauses and conditionals you have the opportunity to increase your grammar mark to 6.5.  Mistakes with these structures will prevent your grammar result from rising above 6.
IELTS practice exams and exercises

Holmesglen Institute of TAFE provides some excellent practice and advice

Links to practice exams on the internet.