One of the things that the examiner will check carefully is whether or not you have fully responded to the question. Here's a question that a student sent me:
Some people think that all teenagers should be required to do unpaid work in their free time to help the local community. They believe this would benefit both the individual teenager and society as a whole.
Do you agree or disagree?
The student who sent me this question wrote about the advantages and disadvantages of unpaid work for teenagers, but completely forgot to mention the benefits and/or drawbacks for society as a whole.
If you don't fully answer the question, it's extremely difficult to get a band 7.