Mathematics is more difficult than textbooks, and Olympiad is simple. It mainly involves the following knowledge points: 1) Calculation problem (about 30 points): It mainly focuses on fast calculation, solving equations and solving equations. The proportion of investigation is increasing, and a large number of additional questions also involve calculation. 2) Fraction percentage (about 40 points): mainly investigate the application, ratio and proportion of the unit "1". The application questions involving the percentage of fractions are moderately difficult, accounting for 60% of the questions. 3) number theory (about 15 points): mainly investigate the application of prime numbers, composite numbers, divisors and multiples. 4) Surface area and volume (about 20 points): mainly investigate the area of circle, sector area, surface area and volume of cube, cylinder and cone, focusing on investigation and calculation (such as the last line of 09) 5) Application questions such as travel and engineering (about 20 points): The investigation of travel and engineering is more difficult than the textbook, close to the Olympic level, and other issues involved are: average, positive and negative ratio, and so on.