Much of this is included in the test-preparation material as experiences to illustrate skills or practice them on. MEIS seeks areas where it can improve math education. Generally its backers want to remain anonymous. Presently the area offering the most opportunity is texts. This is particularly true in forming problems into math.
Students see a range of skills applied in a sequence and try to duplicate the process.
An analogy is a future cook, preparing and serving a multi-course dinner after watching it done. The next meal triggers another sequence with its recipes. Essentially this is a review or test approach, leaving the skill learning to the student to do on his own through observation and trial. Fortunately for our stomachs, the elements of food preparation are learned separately with more learning about coordinating them. Heading math education in this direction would make it more nutritious, digestible and taste better.