This is not necessarily true. A score of a 50 may mean the kid has yet to be exposed to the topics covered on the exam. True, they should be at this point, but not all schools are created equal which is why schools also consider diversity of where these kids come from. It has no indication that the kid is not capable of learning some topics he missed with a little extra studying or tutoring, but what it does indicate, is at this single point in time, the child did not understand these particular questions. There is zero indication as to why or how.
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