Aside from helping better your reviews, if a student wasn't an advanced reviewer before the class, they will be upon graduating. This is typically the preferred way to get advanced standing so you can start writing good reviews from the get go. A mentor can also help you familiarize yourself with the site and what it has to offer, help with video reviews, and basically any questions you might have about Eden.
Also, the mentor will get a 25$ gift card for each student that passes their class and gains the advanced reviewer standing. Some mentors can get assignments for their students, but not all of them will do this.
Anyone can be a student, regardless of your standing or rank. It's really is a great program.