As you can see, grammar is important even once you go to study in the US. It will always follow you and come to bite you in your behind at the worst situation possible. So, make sure to study it well while you can
P.S. This is the email my student who is currently studying in US has received

Do you think we can use "fall out of favour" for the minimal decline in the figure for accounting?

Fall out favour ≠ become less popular
Fall out of favour = become unpopular
Can't really be used for a small decline in percentages/figures
I have seen so many instructors (including some with band 9) using it wrong.

https://www.bbc.com/future/article/20171220-how-to-be-remembered-in-1000-years

https://www.bbc.com/future/article/20171220-how-to-be-remembered-in-1000-years

I'm thinking of organizing an online Writing+Speaking course. The lessons will be conducted by me personally. Every day. 1 hour. 5 days a week. What do you think would be a fair price for such a course?

It looks like it's time to increase those numbers. Would you like to be second 8.5 or sixth 8.0 or perhaps the first 9.0?

It looks like it's time to increase those numbers. Would you like to be second 8.5 or sixth 8.0 or perhaps the first 9.0?

https://medium.com/@content.hobbifun/why-does-the-brain-resist-learning-new-activities-3bb9fb6f7ed4