Divide primary school mathematics into several blocks.

For example: numbers (integer, fraction, decimal, percentage)

Equation (calculation, application problem)

Graphic area (triangle, rectangle, trapezoid, parallelogram, circle)

Three-dimensional graphics (cuboid, cube, cylinder, cone)

Equal compaction foundation

Secondly, the difficulty is the choice of exercise questions. The principle of exercise selection is: 1, taking care of 95% of students, that is, exercises with difficulty coefficient of 0.85 account for 40%; 2. Take care of outstanding students, that is, take care of 25% exercises with a difficulty coefficient of 0.65; 3. Take care of exercises with 5%- 10% difficulty coefficient of 0.4; and