I wanna write an excuse to my teacher with the following content:
Dear Mr....
I am sorry to inform you, that I can not come to our course tommorow.
I should like to earn extra money and so I am on the "GTI Treffen" which takes place from Wednesday to Sunday this week.
I have a request to you: Could you send me an E-Mail to our questions for the test exam?
That would be nice.
And to all my colleagues: Good luck
Next Wednesday we will meet again.
Sincerly