Including integration by parts and trigonometric substitution.
While the solution book is a powerful resource, it can also be a crutch. If a student begins "reverse-engineering" every problem—looking at the solution first and then writing down the steps—they lose the cognitive benefits of the Kumon method. kumon math level o solution book
Because Level O is the final step before the "X" levels (elective topics), the difficulty spike is significant. This is where even the most gifted students often hit a "plateau." The Role of the Level O Solution Book kumon math level o solution book
Do not look at the solution book until you have spent at least 15 minutes stuck on a single step. kumon math level o solution book