How each scale is laid out
Each measure of the scale starts with a quarter note on beat one, then eighth notes, up and back down. The arpeggio follows in triplets, and the scale ends on a whole note. With 2 octaves on, a scale that would go past the range on this sheet is printed in one octave and marked "1 octave".
Natural, harmonic, and melodic minor
Natural minor uses only the notes in its key signature. Harmonic minor raises the 7th note, going up and coming down. Melodic minor raises the 6th and 7th going up, then comes down as natural minor. Coming down, the 6th and 7th each have a courtesy accidental, a reminder that they're back to the notes in the key signature. Each minor scale shares its key signature with a major scale: A minor with C major, D minor with F major, and so on.
Keys with two names
D♭ and C♯ major sound the same, and so do G♭ and F♯, and B and C♭ (and their relative minors). Use the spelling buttons to print the one your music uses.
Practicing scales
Use a metronome. Start slow enough to play every note clean and in tune, and speed up only once you can play the scale twice in a row without a mistake. Say or think the note names as you play, and learn the fingerings with them, so both are automatic by the time the scale is fast.