To learn, someone has to tell you how you are doing, so you know what and how to improve. so some kind of testing is necessary.
Standardized testing allows comparison with others, so you know roughly how you compare. It breaks the isolation that occurs in most schools, and gives students who are not the teachers favorites a chance. A lot of home school students use standardized test to be able to do these comparisons fairly, because the public school teachers cannot be trusted to make these judgements.
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