Dear John,
I'm very glad to hear that you have passed the entrance examination and been accepted by a very famous university. I feel very proud of you and I believe you really deserve the honor since you have been working so hard on that.
As you have mentioned in the letter, there are both some similarities and differences between college life and the life in high school. First, you have to go on working hard as there are a lot of subjects for you to learn. Second, in high school, teachers will probably tell you what to learn and how to learn in details and will also monitor your learning performance, while in college, teachers work like tour guides and you have to find out your own ways to acquire knowledge and solve problems.
Last, be optimistic. If you hope to adapt yourself to this new environment, you'd better be positive no matter what difficulties you will experience in your college life.
May you adapt yourself to the college life as soon as possible!
Truly Yours,
Carolyn
