McGraw Hill Must Know is an iPhone app that offers bonus flashcards for the Must Know series. These flashcards serve as a valuable tool to test your knowledge as you progress through the associated books. Each set contains over 100 flashcards, presenting information on both the "front" and "back" sides.

With a focus on enhancing learning retention, these flashcards are designed to aid in reinforcing key concepts covered in the Must Know series. Whether you are studying for exams or simply aiming to deepen your understanding, the interactive nature of these flashcards can be a beneficial supplement to your educational journey.