Also look at the discussion tab for the How to Play the A chord page in the JG website.Grade 1 lessons.
Here is a link if you haven’t looked yet - How to Play the A Chord Community Discussion
I agree that you have made a lot of progress. Once you get to 30 changes in a minute I would suggest that you look ahead to module 2. You only learn one new chord (E) that I find easier to play than either the D or the A chord and with those 3 chords you can play a lot of songs. You will also learn a faster way to change between D and A and E chords. Have fun.