Linear algebra: youtube.com/playlist?list=PLrv_b_Wg7BhQlPZ49yEGWXd02VuqVhaXz
Convex optimization: youtube.com/playlist?list=PLrv_b_Wg7BhQgo5r3RfcrgECYl2KiHHWv
Probability and random processes: youtube.com/playlist?list=PLrv_b_Wg7BhSmIgfyN_iNLIK1fbpWVcVQ