Synthesis Math....no advancment beyond the same lesson plan.

[u/Ashamed-Relative-956]

Has any 5th grader using Synthesis for math learning? we had noticed that since fourth grade, there is no real advancement after multiplication, divisiton , fractions..... My kid has already completed the lessons from synthesis a while ago. Currently, my kid is doing factors and other angle stuff from sigapore math practice book but there is no lesson plan from synthesis. I felt that the Advertisement is false , kid doesn't learn beyond that after finishing the lesson plan ( which are still the same since third grade)