A standardized test is one that is administered and scored in a consistent manner. It is designed so that the questions, conditions for administering, scoring procedures and interpretations are consistent and scored in a predetermined manner. Any test in which the same test is given in the same manner to all test takers is a standardized test and is perceived as being more fair than non-standardized tests. They are intended to provide a more reliable comparison of outcomes across all test takers.
Here on LawServer you’ll find articles about standardized testing, relevant state laws about standardized testing.