The textbooks of science students are more in-depth than those of liberal arts students, and with the series of elective courses 3, 4 and 5, the total number of textbooks will eventually be more.
However, the content of elective course 2- 1 is not more than that of elective course 1- 1. For example, the third chapter of the mathematics textbook for liberal arts students, "Derivative and Its Application", belongs to the elective course 2-2.
For another example, chapter 3 "Derivative and its application" in 1- 1 only studies derivative and optimization problems, while chapter 2-2 "Derivative and its application" expands the concept of definite integral and the basic theorem of calculus (basic? Theorem? Yes? Calculus). See the figure below for details of this paragraph.
On the website of People's Education Publishing House, you can consult all electronic teaching materials in the form of pictures for free:
High school mathematics textbook for liberal arts students
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High school mathematics textbook for science students
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Among them, the teaching materials of the elective part are different.