Very good point, Rachel @Libitina 
. While watching the video, I couldn’t sometimes visually identify the chords played in the songs. Now, I know why. It is the hand positioning.
Yes, @SatanicSaint, I think you’d better work on this during grade 2 to avoid future problems with your wrist and/or shoulder 
.
Edit: I’ve just found this thread. It might be of interest for your 
. Help Straightening Wrist