• JG: https://www.youtube.com/watch?v=DrEXTC6mIO8&list=PL0o_zxa4K1BU5sTWZ2YxFhpXwsnMfMke7

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• Professor Leonard): https://www.youtube.com/watch?v=9OOrhA2iKak&list=PLDesaqWTN6ESsmwELdrzhcGiRhk5DjwLP 

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• Varsity Tutors (Free Trigonometry practice tests): https://www.varsitytutors.com/trigonometry-practice-tests#practice-tests-section

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• Varsity Tutors (Free precalculus practice tests): https://www.varsitytutors.com/precalculus-practice-tests#practice-tests-section

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• Berkelay city college: https://www.berkeleycitycollege.edu/wp/kpernell/previous-course-resources/precalculus-i-resources/

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• Hollywood high school: https://www.hollywoodhighschool.net/apps/pages/index.jsp?uREC_ID=116947&type=u&pREC_ID=198252