Covering 6 standards and 3 domains, these problems are quite varied. They are in domain-cluster-standard-skill order where "skill" is a subset of a standard. Within a skill, they are in difficulty order.
The reason for the 4 sets of problems is that everyone has different needs and different time allotments. So, the shorter worksheets work for some and the longer ones for others.
[The problems in All WORKSHEETS and PREVIEWS are printed in difficulty (1 [easy], 2 [not so easy], 3 [proficiency]