The workbooks are divided into 5 strands:
and 5 Levels:
Levels 1-3 contain ten books each of Arithmetic, Measurement, Problem Solving, Algebra, and Calculus.
Level 4 contains ten books each of Measurement, Problem Solving, Algebra, and Calculus.
Level 5 contains ten books of Calculus.
The five math strands are much like the strands of a rope woven together to make the rope stronger and are meant to be worked in concurrently to make the child's math education stronger.