Significant jumps from learning level to learning level are discouraged. This will only cause difficulties for students and impair learning. The materials used by the Kumon Method have been constructed in a manner in which students progress in small steps through the learning process. At all times, each student is learning at a level that is just right for him or her. Worksheets are constructed in such a way that students never encounter problems with which they are unfamiliar. Sample problems, that include many examples, are always provided when moving into new areas of learning, assisting students in learning these materials on their own. As a result, students can effectively learn by themselves.

The mathematics program consists of 4,620 worksheets with 21 levels, from level 7A through O, with these levels extending in difficulty directly proportionate to the alphabetical listings, with 7A being the easiest and O the most difficult. The worksheets focus on the development of strong calculation skills and aim to assist students in advancing by themselves as directly as possible to high school mathematics by avoiding all irrelevant concepts. This is the prime feature of the Kumon worksheets.

Kumon consistently checks to assure that no problem areas exist within the materials that would cause hindrances to the students. All worksheets are reviewed routinely, and continuous revisions are made based upon feedback from students and instructors. In every way, this is a learning method that continually places the students at the core of the learning process.