Studying in multinational environment has its advantages and disadvantages. Main advantage is diversity. But sacrifice is the level of English.
You need to express yourself. You care about letting people know your idea. You talk to the guys from 37 different nationalities. And different levels of English, of course.
Well, I've got fluency and freedom of expression, but grammar went down obviously. And since the speed of thoughts now is incredible - I'm fixing everything I need, there is no time for revision.
Put the grammar note on todolist and sighed when was looking at her grammar book.