As for part A, speed up the tune and include the ornamentation. Pay particular attention to rhythm. If you're confident with the left hand try to include some bass: it’s essentially all played on the D(press)/A(draw) buttons of the bass. Keep the basses pressed right up the fourth bar of this part if you like. If you’re going for big impact keep both buttons down. If not you might just want to press the Chord button (the upper one of the pair). Alternatively, for variety, just drone on the lower button of the pair.