As for math problems, I would have been a member of that group had my mother not been an algebra teacher.
I had a HORRIBLE Algebra I teacher, and I came home every day and my mother retaught me the day's lesson. Had I not gotten that firm foundation from her, the rest of high school and college math classes would have been a nightmare. However, due to her and her alone, I never had a problem making A's in all my advanced classes. In fact, I took trig in eleventh grade, and I remember one night, my mom came into the dinign room and looked over my shoulder while I was doing my trig homework. She said that the stuff I was doing was what she did her junior year in college. That made me feel like a million bucks.