There are both ineffective teachers and ineffective students. Both have destructive effects on learning.
There are also ineffective (and downright destructive) curriculae. They often carry more weight in stopping the learning process.
Don’t forget the new policy of letting thugs in the classroom swear and beat up the teachers and not be suspended,that comes from the Dept. of No Education.
It’s racist don’t you know to suspend black students for such behaviour