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Good luck! I'm over 40 and just had my midterm for General Linear Models (statistics + linear algebra). This YouTube playlist was invaluable for me: https://youtube.com/playlist?list=PLmM_3MA2HWpYYo7QExaRvor_unoSIZYYh https://youtube.com/playlist?list=PLmM_3MA2HWpYYo7QExaRvor_u...