This post is for recomend you a website where you can improve, learn and review by yourself. It is called Kahn Academy and you can watch videos and do exercices. The main subjects are Math, Science, Economics and Humanities (History, Art History and American Civics).
Khan Academy
To make and idea, here gos one exemple of the videos you can find out threre.
Basic Trigonometry
So enjoy the Academy when you want and where you want.
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