A to D change (most frequent in songs at this level)
Same principle should be used as in Level 1 for the E & A change. Keep your first finger down and just lift off fingers 2 & 3 to change chord!
If the D chord isn’t ringing out when you change
Don’t keep your 1st finger totally still. Instead, slide it from the middle of the fret on the A to the ‘good’ side of the fret on the D! This is the most common cause of the D chord not sounding good during a song- make sure you slide the 1st finger over!

The anchor finger is crucial here. Any chord change you struggle with should be practiced for a minute each practice session. With 3 chords, we have 3 possible chord changes. They are:
Practice and repeat these changes and aim for a speed of around one strum of each chord per second!