>>60859518 (OP)
Anything below the 10th grade and you're just babysitting them. Imagine cycling through hundreds of kids and you can clearly see who will be successful and who will struggle in life.
For every 1 kid you personally help, there are a 100 different kids that slipped through the cracks.
Imagine a rapid flowing stream where the water are the kids who you're teaching, and you have a bucket that "teaches" or catches the water in there. Sure you can get a bigger bucket to catch more water, but unless youre intellectually strong, the workload will go past the point of exhaustion.
Common core math in america is the reality of using a 100 gallon bucket with holes at the bottom, with a teacher that cant carry a 100 gallon bucket to get as much water claimed as possible.
Now that bucket is forever stuck in the water, without anyone being able to lift it out of the river to claim that water.