When filling out the Common App, your basic application will ask for a list of all schools which you attended in the past. It is imperative that you list each and every college you attended. Yes, it's true.
In addition, you have to list your secondary school. Many applicants are confused by this term. It is not one that we use often, but you should know that your secondary school is your high school. Many students who applied for spring put their college in this spot. This is not a college or university; it's a high school.