concernd or worried, test or class-work

[vil]

Dear teachers,

Would you be kind enough to tell me your preference for usage of more adequate words in the following sentence?

I am concerned about the next test in French.

I am worried about the next class-work in French.

Thank you for your efforts.

Regards,

V.

[Soup]

Dear teachers,

Would you be kind enough to tell me your preference for usage of more adequate words in the following sentence?

I am concerned about the next test in French.

I am worried about the next class-work in French.

Thank you for your efforts.

Regards,

V.

My preference, I'm worried about the next French test.

[Offroad]

Hmmm... Interesting. Something tells me there's a slightly difference between them:

I am concerned TO / OF / about the next French test.
Sounds like a French teacher...a person who is in charge of teaching French.

I am worried about the next French test.
Sounds like a student who hasn't studied for the test.

Am I right? I guess the prepostion will tell when they are diffent from each other.