A test is an evaluation of knowledge leveraged or gained. If the test is seeing a significant number of failures, then it is indicates that instruction is not aligning with the evaluation metric. Students should be measured and addressed according to each individual's aptitude; there is no reason for our goal to be 100% students going to college. 100% going to college means the colleges have lowered their standards.
The current situation is that the public school system (K-12) has one goal: College bound. There is no method while in this system to adapt a student to a trade. Germany does a good job of telling students that they are not college material and then having a non shamed option to pursue (trade or apprenticeships). In America, someone saying they are without a college degree is shamed or looked down upon; unless they are an entrepreneur who makes it big.
Betsy deVos can upset the status quo because in the last twenty years have you seen a change in the education system that would address the individuals who are not college material? Is there a program in place that can upend the crazy bureaucracy that currently exists maintaining the aforementioned binary outcome from K-12.
As an aside, the federal government's education programs create compliance structures that increase rent seeking systems that increase the bureaucratic overhead. An example of this is to look at the increase in administrative personnel at a university for the past twenty years. Most colleges have a tooth to tail ratio increase, high schools have seen administrative bloat significantly increase to take advantage of the grants available.