Public school critics often blame teacher tenure for keeping bad teachers in the classroom. Is that really the problem in education? Or is the challenge too few great teachers and too many adequate ones who perhaps could — if provided the opportunity — make the leap to highly effective? Readers share their views on teacher quality and whether we are doing enough to help teachers hone their skills. In a guest column, Georgia’s first lady talks about the importance of getting kids reading by the end of third grade, and says schools can’t do it alone.