In order to gain 10 out of 10 for the "content" side of this question, there are certain things a student must do. I would say the easiest way to gain a marker's confidence is responding to all four bullet points listed below the question in your answer, and even though it might be hard to respond to them all equally, as long as you reference each bullet point, you have a chance of getting full marks. You want to make sure that you convey a lot of information, which is do-able within the ~90 word limit. But importantly, the marker is also looking for opinions, which is very easy to do also. Make sure that every or almost every statement is backed up by your personal thoughts; an easy way to ensure this occurs is including signpost statements like "Je pense" and "A mon avis".In terms of the 6 marks allocated for "quality of language", it is okay to make mistakes, as long as they are generally quite minor and not too common. What is important to bear in mind is that what you are trying to say comes across clearly. This means it is best to stick to set structures; for example, I would recommend using a structure like "je voudrais" + an infinitive verb, e.g. "je voudrais habiter aux Etas-Unis", because it is quite easy to stick this structure in and it also shows an ability to use different tenses, such as the future tense. Again, it would be easy to back this up with an opinion by saying "parce que" or "car...".