In my DecaDynasty I was terrified the heir wouldn't make it onto the honour roll so her dad tutored her up to a B. She made with one whole day to spare. In her teenaged years, her dad tutored her again, but only up to a high C. She got onto the honour roll in four days!
Sorry to hear about the fail. Just learn from your mistakes, time births and plan ahead. That is working for me right now (Touch wood!).