Take People's Education Publishing House as an example. The first and second units of mathematics in the second volume of the seventh grade are from intersecting lines and parallel lines to real numbers.

The seventh grade refers to the first grade of junior high school, which is the primary stage of middle school career and an important stage of adapting from primary school to middle school.

The first grade is the most critical moment in the whole middle school. It is a link to adapt to the study life in middle school, the new environment and the new teacher's teaching method. If you can't adapt to the new environment at this stage of junior one, it will be more difficult to study in junior high school in the future.