Mojo Pages is a business directory website which like many others puts businesses on their site for free and then encourages you to pay to upgrade. They don't charge anything for customers to view the site or to post a review. Please let me know if you find any changes in their policy. I have no current reviews on this site yet so please feel free to write a review if you are a current or past student of mine.
Write a review. Note the location of the "Vote For Us" button on the left figure below before going there. Clicking on that button gets you a starting screen like the one in the right figure below where you can leave your review.