You can't buy it above level 2. The primary growth fund is 1Q coins, the intermediate growth fund is 5Q coins, and the senior growth fund is 1Q coins, and the coupons are returned. You can get grades 1, 2, 3, 4, 5, 6, 7, 8, 9 ... If you want to buy, you are advised to buy advanced, but you'd better not buy anything. . TNT will have unexpected pits waiting for you to jump. . .