'''Standardized tests''' distinguish between students who are ready for advanced courses and those who need more help first.
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Student testing has a "positive effect" on student achievement.<ref>
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93% of studies have found student testing, including the use of large-scale and high-stakes standardized tests, to have a "positive effect" on student achievement, according to a peer-reviewed, 100-year analysis of testing research completed in 2011 by testing scholar Richard P. Phelps. [http://standardizedtests.procon.org/]</ref>