good night

My finals will begin tomorrow . I hope I get good grades in all of them. I really hope I get good grades in all of them. 

Great job and keep practicing!

Good night all.

I Finals will begin tomorrow. I hope I get good grades in all overall. I really hope I get good grades! in all.
Please, oh please...

Here is a more casual way of saying the same.  Good luck on your tests!

Good night.

My finals will begin tomorrow. I hope I will get good grades in all of them. I truly hope I will get good grades in all of them.

Please, please.

Other than the tiny errors and missing words, your english is pretty good! Keep up the good job. :)

Good night/evening ('good night' is like 'goodbye', and 'good evening' i like 'hello')

I My finals will begin tomorrow . I hope I get good grades in all of them/everything. I really, really hope I get good grades in them all! (why the repetition? Just to stress?).
please, oh please!