Make and Remember
Make and Remember is a tool for learning the circle of fifths by heart. Once you know the order of the keys, you know their key signatures, because each step around the circle adds one sharp or one flat.
The mnemonic
Open More, then Make and Remember. It shows the circle with a mnemonic, a short sentence whose words start with the keys in order (C, G, D, A, E, and so on). Reading the sentence walks you around the ring, so the order becomes a phrase you can recall rather than a list to memorise.
The quiz
The quiz hides the circle and asks you to fill it back in, one key at a time, starting from the C that is given. It marks the ones you miss, so you can see where you are still unsure. Run it a few times and the order sticks.