Your task response mistakes are KILLING your mark.
Let's see an example.
Many people believe that playing video games is a waste of time and can even have a negative effect on the health of players. To what extent do you agree or disagree?
Answer: Nowadays, playing virtual games have become a popular source of entertainment. Some people think, playing video games is detrimental to human health as well as not worthy of our valuable time. Due to it's unfavourable ramifications, I also think in the same way.
You have TWO things to address in the question.
One, 'waste of time', and two 'negative effect on health'.
SO, your thesis MUST mention these. (don't waste words on what 'some people think'.)
This essay will argue that video games provide very little benefit to the player and that negative effects on health like obesity are common.
see how it works? That's how you get your TASK ACHIEVEMENT mark.
Question says what about THIS and THIS, your thesis says 'this essay will talk about THIS and THIS'.
If you don't do it, the examiner has a bad impression of your essay right from the start, and there is NO chance of getting 7.
Be smart: answer the question!