| A resume isn't necessary because what the school wants is information that the teachers know that's based on what they saw you do in class and in organizations that they advise. The colleges don't want the teachers to basically rehash your resume.
What can be helpful to give the teachers is: a copy of your college essays; copies of one or two excellent term papers or tests that you did for their class; a note about your contributions to any organizations that they advise, and info about why you are applying to the colleges you chose, and what you plan to major in and are considering as your eventual career.
When I was a college prof, I wrote recommendations for students, and the kind of info that I suggest is what I found helpful. No matter how much your teacher likes you, s/he isn't likely to remember specific details of your performance without your providing reminders like tests, papers, a memo. |