题目内容：

阅读下面短文，根据其内容写一篇60词左右的内容概要。

High school exit tests are tests that students must pass to graduate from high school. In the last few years. however, a number of states in America have dropped them. Although some states still use them for diplomas, the number is down from a high of 27 states during the testing craze promoted by No Child Left Behind (NCLB).

The appearance of this phenomenon is small wonder. Researches clearly show that exit tests have little positive effects on students. A 2014 report found exit testing was associated with lower graduation rates, negatively affected labor market outcomes, and, most alarmingly, produced a 12.5 percent increase in incarceration( 监禁)rates. Exit exams, the study concluded, had tended to add little value for most students.

Exit testing relies on the following assumptions. One is that standardized testing can serve as a kind of “quality control”for high school graduates, guaranteeing that graduates are college ready.The other is that they have predicting value for future success in academic situations.

But there is little evidence. The tests don't exactly measure what they pretend to measure. For example, qualities such as intelligence, academic ability, college readiness are not determined.Those that should be developed in all young people, like responsibility, critical thinking,and empathy (移植),are not measured,either.Even supporters of exit tests have acknowledged that they don't offer reliable data.

Thus, more and more people are suggesting that exit test scores ought to be just one component of the high school diploma. Schools should consider many other records including credits earned, courses taken,activities, service, projects and other elements of academic accomplishment so that students can be evaluated flexibly. In other words, exit test scores should never be the only criterion for high school diplomas.

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