A few important things:

1) Start with an exhaustive analysis of everything on the market, including everything designed for the test and everything you can think of that might be relevant even though it was designed for a different purpose. Cobble together a best-of packet and make sure it includes everything a kid needs to know. Put it in a rational order: i.e., the order that you would most like to use it in, the order that would make your student feel comfortable and confident if you got hit by a bus and the kid had to follow the order of concepts completely on his own. Consider *both* how skills build and how concepts build. Plan by priority, not by some fantasy of comprehensiveness. Remember that frequency of concepts is hyperbolic, not linear.

2) Think about the ladder of mastery. Automaticity, automaticity, automaticity, automaticity. . .

3) Think about constitutent and complex skills.

4) Think about realistic practice.