Scheudles are too tiring.

These days I am really tired.

>> These days, I am really tired.

or

>> These days, I feel really exhausted.

Going to school and having more than 6hours class makes me really tired.

>> Correct

I signed up new math academy and it became over a week.

>> I signed up for a new academy and it was over in a week.

Going math academy is a little far and the time about the math class is longer. And I have to review all the subjects I had learn.

>>  Going to the Math academy is a little far and the time for the Math class is longer. I have to review all the subjects I had learned.

In the past I wasn\'t sleepy in the evening but now I went asleep after lying in the bedroom.

>> In the past, I was not sleepy in the evening but now I fell asleep just after lying on my bed.