Achievement Test
Test designed to evaluate mastery of a given body of material. Grades are generally based on achievement tests. The SAT (Stanford Achievement Tests) is an example of an achievement test. See also Aptitude Test
Critical Thinking
The art of analyzing and evaluating thinking with a view to improving it (Foundation for Critical Thinking).
Cronbach alpha
Cronbach's alpha is a measure used to assess the reliability, or internal consistency, of a set of scale or test items. In other words, the reliability of any given measurement refers to the extent to which it is a consistent measure of a concept, and Cronbach's alpha is one way of measuring the strength of that consistency. See more here: Virginia stat Consulting or here (Wikipedia).