Education research for the last 40+ years would disagree heavily with you. Standardized testing primarily reflects the ability to repeat rote information you've memorized, and is especially useless on question types like multiple choice or mix and match columns. We also know there are plenty of students who have inhibitions to standardized testing including executive function, attention, and learning disorders - and that most of those kids are not being put into an IEP or special needs program that can fit their needs.

I know it makes sense on paper (heh) that if you can't put it on a test you don't know it. But that's not really an accurate reflection of what a student knows or how they think, there's better ways for us to go about this with evidence-based learning science