I think it’s the language that matters most of all. You should try to make it sound as convincing as possible.
Then it’s probably, the audience and the topic that you should also keep in mind.
First of all, you have to pick your stance on this subject matter. You have to make sure that your argument is reasonable, and your opinion is backed up by pieces of evidence.
I would recommend you to look for peer-reviewed articles on this topic to have a better understanding of this issue.
The common rule is yes, teachers do assign some homework for a spring break.
On the other hand, it depends on the type of teacher you have.
Who told you that we start college at 16 in Great Britain?
I guess you confused terms. College in the United States means the university or any higher education. In the UK College is referred to the last years of education in school.
If you mean University, then we start it at the same age, around 18 years old. In case you want to study at the British university, you should come after your final year at school.
Are you sure that you want to go to America because it has nothing in common with movies?
You should go to Canada.
There are a lot of amazing universities in Canada and more friendly society.
You should study 4 years in the US to get the Bachelor degree.
After the MCAT exam, you will study 4 more years. You will not get the scholarship.
Be sure that you can afford it. After the graduation, you should live the US.