SSC CPO SI and ASI 2013 Paper

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Directions (Q. 176–180): In the following questions, a sentence is given, the underlined part of which may need improvement. Alternatives are given below at (1), (2), and (3), one of which may improve the sentence. In case no improvement is needed, the answer is (4).
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Question : 180 of 200
 
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A high school student is not even understanding the basics of Chemistry and Physics.
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