1. New thinking of mathematical inquiry application (highly recommended by individuals)
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2. Olympic Mathematics Series-Junior High School Volume
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3. Junior high school math teachers cultivate excellent classics.
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These are all quite good. You can go to the bookstore and choose one that suits you. Interest is the most important!
Landlord, the three books I recommended are not very popular here, even online. You can buy it here anyway. In other words, Xinhua Bookstore over there must have it, or it is sold out (showing how popular it is). You can register the lost books. I really can't buy a discount free of charge online (Dangdang or Joyo), and it will be delivered in about 3 days.