Sue felt she should ..... on her math skills before she started school

English as a Second Language English Vocabulary, Grammar and Idioms
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Sue felt she should ..... on her math skills before she started school. (*) brush on (*) brush over (*) brush up

This is a companion discussion topic for the original entry at https://english.best/questions/6305,sue-felt-she-should-___-on-her-math-skills-before-she-started-school/
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What you need here is a phrase that means ‘to improve her math skills’.

brush_up_on_your_math_skills

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