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If it is an entrance exam and they have math, chances are they won’t go into huge detail and make you memorize formulas. Maybe you can review some Math concepts from the SAT or ACT?
https://www.khanacademy.org/test-prep/sat/sat-math-practice
Khan Academy has some great math lectures to watch and you can find some practice questions online… and the best thing is that those lectures are free! I would focus more on solving practice questions than reviewing everything in math.