[zozbot234]

Well, you need a few tricks to fully internalize the diatonic scales from that mnemonic.

Such as the fact that the circle of fifths also determines the type of sharps or flats found in the matching key signature, and that the last-added "sharp" in the key signature pertains to the leading tone in major (G major has an F#, and so on) or the second scale degree in minor. Conversely, the last-added flat in a key signature pertains to the fourth scale degree in the major mode, and the next-last (if any) to the tonic.