Summer vacation starts.

Today summer vacation was started.

>> Today, the summer vacation has started.

or

>>  The summer vacation has started today.

But I don\'t happy because summer vacation is just for 3weeks.

>> But I\'m not happy because our summer vacation is just for 3weeks.

After 1week I may be say going to school is around the corner.

>> After a week, I might say, time to go back to school is just around the corner.

Tommorrow there will be a Mt at church.We are going to play a lot.

>> Correct >> What does it mean by MT?

On Monday to Wednesday there will be a camp at church.And there will be baseball game,too.I

>> Correct

 I have to study math and science harder.

>> Correct

And I will memorize Chinese words too.

>> Correct

I will prepare mid-term to overcome my failure at specific subjects.

>> I will prepare for mid-terms to overcome my failures at specific subjects.

The weather is hotter and hotter and I have to overcome the hot weather and take care of me.

>> The weather is becoming hotter and I have to overcome this weather and take care  of myself.

Summer is good for catch a cold.I really hate summer.It makes people angry.

>> Correct

But after overcome summer autumn will greet us.I can see beautiful leaves on September.

>> But after summer, autumn will greet us. I will see beautiful leaves on September.