Reply To: How did your kids do on Lessons C-1 to C-4? Welcome to BFSU: › Forums › Open Discussion › How did your kids do on Lessons C-1 to C-4? › Reply To: How did your kids do on Lessons C-1 to C-4? July 21, 2018 at 10:55 pm #7099 peywueiParticipant My kids did okay with the energy concepts. My husband has been reviewing with them since we finished book 1 and although they don’t remember everything, the basic concepts were there. I think it was a good introduction.