Final answer:
Course evaluation surveys or feedback systems contain reviews and information from students who have attended the class beyond the withdrawal deadline. These surveys are tools for students to learn about professors and courses through the experiences of past students.
Step-by-step explanation:
The method of learning more about professors and their courses that contains information exclusive to students who have remained enrolled past the withdrawal deadline is likely a course evaluation survey or a student feedback system.
Institutions often use such surveys to gather student feedback on the effectiveness of teaching and the course content. Only students who have participated in a significant portion of the course, typically until the withdrawal deadline, are eligible to provide feedback to ensure that the evaluations are informed and representative of the course experience.
Speaking directly with professors during office hours, as mentioned in the provided reference material, is another valuable strategy for students to gain insights and help on difficult or interesting topics. This direct interaction is beneficial for both students and educators.