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20 17 college entrance examination is the most difficult in the history of mathematics.
Zhejiang is the hardest. 20 17 math difficulty ranking of college entrance examination;

1, Zhejiang volume, with a difficulty coefficient of 5 stars.

2, Jiangsu volume, the difficulty coefficient is 4 stars.

3, Shanghai volume, the difficulty coefficient is four stars.

4, the national volume 2, the difficulty coefficient of three stars.

5. The national volume 1 has a difficulty coefficient of 3 stars.