The mentor program is fantastic! (I say this as a current student). Basically, a class is just a one-on-one thing that connects you to a mentor, who is an advanced reviewer who really knows their way around EF and has written a lot of helpful reviews. After writing a review, instead of submitting directly to an editor, you submit it to your mentor. They'll read it and give you comments and suggestions about how to improve. You then edit your review, and submit it back to them for approval. In the meantime, you can ask them questions about what to include in reviews, how to improve your writing, and any questions you have about reviewing, features of the site, etc.