My DD is 13 and would love to be a Beta Reader. She is a good writer and a reader. She is working on her own novel as part of NaNoWriMo but doesn't want to get it published. She doesn't know much about horse riding though.

Thanks for asking this question. We are also on the same boat with my 9 year old just starting AoPS Pre-algebra. I am thinking of extending each section into 4 days. First two days to do the problems and exercises and then practice similar problems (that I will get from other sources) for two days to reinforce what he learnt.