NuCode is based around a set of lessons that includes the whole Morse code alphabet and other characters. If you can successfully complete the lessons then you will ace the FCC 5WPM code test.
No previous knowledge of the Morse code alphabet is assumed and you are gently introduced to a few characters to start with in the early lessons. Then you work through to the final lesson at your own pace. Right from the start you practice at your final target speed of 6 WPM with just a few initial characters.
Once you have learned to reliably copy this small group of characters a few more characters are added and you will again practice until you can copy them all reliably at full speed.