MOP Review Tool is an unofficial review add-on for MCAT Official Prep (MOP) that provides a convenient way to hide and show answers for easy self-retesting. Designed for the Chrome platform, this free tool is perfect for MCAT test-takers who want to enhance their review experience.

To use the MOP Review Tool, simply filter the questions you want to review on the MOP website and open the review screen. In quiz mode, the answers are initially hidden for every question. You can reveal the answer by clicking on any of the answer choices or pressing the period key.

Navigating through the questions is easy, either by using the navigation buttons or the left/right arrow keys. In quiz mode, the answer choices for the new question will be hidden until you choose to reveal them.

The MOP Review Tool also offers convenient keyboard shortcuts for quick access. Pressing the period key shows or hides the answers for the current question, while pressing 'q' enters quiz mode, hiding the answers for every question. Pressing 'r' enters review mode, showing the answers for every question like normal. If you need assistance, press 'h' to view the help screen, which lists all the available shortcuts.

Please note that the MOP Review Tool is not officially associated with MCAT or the Association of American Medical Colleges (AAMC). It is an independent extension created by Raj Kundu to enhance the review process for MCAT test-takers.