Could you please correct my English?

It's been two months since I came here. Nothing surprising has happened to me but dreams in English. Having dreams in English sounds cool. However, in my case, the dreams were about my school, speaking English slowly probably because I can't catch what people say when they speak fast. The level of the class has gone up, and there are a lot to do now. I feel exhausted sometimes. I'm going to do what I should do. この表現は自然ですか？

Nothing surprising has happened to me butexcept dreamsfor dreaming in English.

The level of the class has gone up, and there areis a lot to do now.

Nothing surprising has happened to me butexcept dreamsfor dreaming in English.

However, in my case, the dreams were about my school, speaking English slowly probably because I can't catch what people say when they speak fast.

The level of the class has gone up, and there are a lot of things to do now.

I'm’ll goingdo what I have to (do). (Or) I’ll do what I should domust.