I'm very free.

I did ("completed" I think would be better than "did) an exam a few days ago. I had studied since last January. Everyday I studied. Since I have finished my exam, I don't know what I should do.  Now, I'm a very lazy man. I want to do something for people or myself. Please tell me an activity to occupy my time.

Takuro- the biggest problem I saw was that you didn't use any apostrophes (') when you combined "I" with a verb (example "am).  It is not necessary to use contractions and some teachers will tell you that it's best not to use theinm  formal writing.  But if you're going to do it, remember to use apostrophes.

Examples- 

I am= I'm

You are= You're

He/She is= He's/She's

and so on...

Good luck!