The first task is to address the letter correctly. You need to know your audience and be ready to address the writing to the right people. When you know the recipient, you can tailor the information to fit the current situation. Being a writer, you should ask the student about the potential readers.
The introduction is a must when you work on the letter of recommendation university. Your task is to introduce yourself and tell a few words about your professional expertise. And you should also include some info about your relation to the student.
When the introduction is done, you should perform the qualification of the student. What rewards did the student have when studying in college? We’re there any recognitions? You should also include extracurricular activities a student participated in.