Where do you get 80% success from? Reducing the score on an assessment by 80% on average is not what most would infer from “80% success [rate]”, two very differ

Where do you get 80% success from? Reducing the score on an assessment by 80% on average is not what most would infer from “80% success [rate]”, two very different measures. The headline author also has a very liberal definition of “banishes”