If someone has a 35 year teaching career they will have taught over 26,000 lessons.
If you are just starting out, listen to experienced teachers. They may be a bit more cynical, and may have slowed down a bit from the manic pace of their 20s, but their experience is invaluable.
Besides the many issues with standardized testing. Most students have no idea what they missed on the tests and teachers don't either. And typically by time they get results students have moved on to next grade. Yet, we spend billions and place such importance on them.
Why aren’t teachers seen as professionals? How professional would you see medical doctors if they had no supplies, but had donations sites & clear the lists. If they had to to work two jobs to make ends meet & had congress & bill gates deciding how they should be evaluated.