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 recordings of class sessions, or in notes that closely resemble a transcription of the class session or information presented in readings or other course materials. These are derivative works based on the material presented by instructors, or on the course materials. Students may conceivably own a partial copyright in notes where the student has made significant original creative contributions. Regardless of specifics of ownership, University policy states that students may not share these materials publicly without the permission of the instructor.