First of all, the differences in teaching materials stem from people's living habits and customs in different regions. If you have received too much higher education, you can't adapt to it for a while, so you should change it slowly.

Secondly, if all primary and secondary school students in the country use the same textbook, if there are mistakes and flaws in the textbook, then all primary and secondary school students in the country will encounter this "flaw" at the same time.

In addition, the nationwide reform of quality education is not unified, but promoted by regions and stages. In this case, it is not appropriate to adopt a "one size fits all" approach to textbooks.

Finally, I believe that in the near future, all regions of our country will become more and more developed, and the teaching materials of the whole country will be gradually unified.