We went through this 'consultant' crap back when I was in HS (class of 96). In Texas we have standardized state-wide testing. You get 'practice' tests in 8th grade and they start the real testing in 9th grade in the fall. You take it until you pass, every semester, until one last session after graduation--if you still fail at that point you don't receive your diploma.
This test is based on a 6th grad education standard.
The failure rates are so high that almost every class in high school effectively tosses out the required curriculum to instead teach this remedial 6th grade material.
At my school they brought in a consultant to try to boost the abysmal math scores. During the homeroom periods each day they had the teachers pass out workbooks, and did a guided "lesson" over the intercom system. It started off with "2+2." Every student was required to not just write in "2+2=4" but also "Two plus two equals four" into this workbook. The "lessons" did not advance much beyond this.
The stupidity was that EVERY student was forced to do this. It didn't matter if you'd passed years before, didn't matter if you were in an honors class or an AP or Dual-Credit college course. Those classes revolted, with teacher support. It took a lot of threats out of the school and continued revolts before the school relented and at least let our classes turn off the intercom and ignore the bullshit.
It didn't help, either. Our school declared every student they possibly could as either ESL or special ed, as they were exempted from their scores counting against the school's average, but that wasn't enough either. From what I understand they have been borderline on having their certification revoked.
The state's solution this year? Eliminating the tests.