31.5% of teachers do not have an educational background in the primary subject they are teaching.
17.1% of teachers used alternative means to become "teachers".
8.8% of teachers are not fully certified to teach.
https://www.epi.org/publication/the-teacher-shortage-is-real-large-and-growing-and-worse-than-we-thought-the-first-report-in-the-perfect-storm-in-the-teacher-labor-market-series/

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Evaluating 693 undergraduate and graduate teacher training programs, the council found that 40% of programs instruct aspiring educators to use debunked teaching practices, including so-called three-cueing strategies that urge children to guess at words they don’t know rather than sound them out. These methods have recently been banned in some states. https://www.the74million.org/article/new-report-flunks-teacher-training-on-the-science-of-reading/

Red flag on Leftists hating America aside, Leftist teachers hate tests because they can't pass them.