Students own copyrights in the works that they create, even for class assignments. A student may be required to share their work in certain contexts (e.g., submitting copies to instructors, presenting in class, etc.) as a condition of participation in a course (see the relevant University policy), but no one has a blanket right to reuse student works without their permission. Student works should be treated with the same respect shown to works by other authors.
Class notes and recordings
Students do not usually own a copyright in their class notes or recordings of class sessions; these are derivative works based on the material presented by instructors. University policy states that students may not share these materials publicly without the permission of the instructor.