Way to motivate the kid there Oma!!! I think I misread your first post, but if you are asking about Explore/ACT overlap, I believe the tests are designed somewhat so that a score of say 17 means the same on both tests. It's not as clean cut as this, because the ACT obviously has more advanced material, but I believe that's the design intent.
This data is fun...
http://www.act.org/research/policymakers/pdf/benchmarks.pdfBut remember these are goals
for 8th graders to do "moderately well" in college. Of course we'd want our kids to top that heartily by 8th, if not sooner. It's fun seeing just how much sooner that can be,

. The corresponding ACT goals could probably be expected 2-3 years later (junior year?).