The "school grading system" referred to above is a grade given to schools, not students. In his previous position in Indiana, Mr. Bennett was found to have manipulated an A grade to a charter school set to receive a lower grade. Coincidently that school is run by a huge GOP donor (close to 3 million with 130k to Mr. Bennett himself). When the GOP talks about "reform" they mean one thing, private profits. The Bush family is well acquainted with such profits.
Here is a very interesting article on education in Finland. They are at the top in math, science and reading. We would do well to take some hints from them. A long article, but well worth it if one is interested in the subject.
http://www.smithsonianmag.com/people-places/Why-Are-Finlands-Schools-Successful.html