You can absolutely review any product that you did not buy from EF as long as EF carries it and it is the exact same product. All you have to do is go to the product page and use the "Grab it" button (top right of page) to add it to your assignment cart. Then go into your assignment cart and select "Write review." Depending on the product, you may have the option to select either the standard or extended review template. For a new reviewer, I would recommend using the extended template as it prompts you with questions to ensure a thorough review. Lastly, I would recommend the Mentor Program if you are not already aware of it.