How can a student get extra practice?

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I would greatly recommend using Khan Academy as a resource for supplementary material for a math or physics class. Khan Academy allows a student to take an initial test for a course, which will identify what the student's strengths and weaknesses are for that course. It tailors to the student's academic needs by providing them with practice problems for the material they struggled with on the test. This allows the student to specifically focus on the material they need to make improvements on.