Thanks for all your posts. My daughter is 17. I am unable to supervise all her tests as she is at college sometimes and I am at work. However, I am going to supervise as many as I can to see what happens then. I also wondered about control solution? I have tried talking to her but at the moment she is adamant she has been testing correctly and I don't want to push it too much as we have had quite a few run ins about her control recently.
Thanks again, all advice welcomed.