Problem 1: Is the course what you expected? Better, worse, suggestions?
Problem 2: What has your favorite part of the course been?
Problem 3: What has your least favorite part of the course been?
Problem 4: Are you learning things that will be beneficial in your education, career, life?
Problem 5: What are you doing well? What can you do better?
Problem 6: What can I, the instructor, do better?