Dear Professor Benson,
It gives me great pleasure to introduce you Mr. Wang Can, my classmate and best friend.
He is going to pursue his studies as a postgraduate in your university after his graduation here. We have lived and studied together for almost four years. His performance in the school years was outstanding. In addition, he has a very attractive personality and staying with him is always pleasant.
Considering he is an entire stranger there, would you please give him some guidance regarding the postgraduate entrance examination? If it is convenient, could you introduce him to the future tutor? Any assistance you may render to him will be highly appreciated.
Yours sincerely,
Li Ming