First of all, I am dutch. I have a paper due tomorrow regarding my motivation on picking up "Cambridge English",
This is what I came up with, please be so kind to correct me in any way.
Dear Mr. van den Berg,
I would like to pick up the Cambridge English class next year. Recently I had a talk with Mr. Nijsink regarding the lack of challenge I have gotten over the past few years. Ever since I've aspired to pick up Cambridge English, which will certainly challenge me more than the regular classes. That is what I am looking for, in a nutshell. I seek a challenge, one that I can sink my teeth into.
Although I don't yet know what to do after my graduation, I think that Cambridge English will certainly help me get accepted into a prominent college, and later on in my life it could even help me land a job. English is the most important language nowadays, and speaking it fluently is certainly a must in today's society.
The letter is much better now, all thanks to you! They just have to accept me now, there is no reason not to. :)