Debbie-
This probably won't catch you in time, but it sounds more like the principal is having the math teacher do a "screening" not an "assessment". An assessment has to be administered and interpreted by the school psychologist or a SPED teacher who has advanced training in evaluations and measurements.

At least that's my understanding of it.

I'm looking forward to hearing what you think about Saxon math.

best of luck...

Willa Gayle