Khan Academy user here, I've noticed the lack of exercises for the organic chemistry and linear algebra courses. There definitely are exercises for these subjects, but not in the main courses. For example, many organic chemistry concepts have exercises in NCERT courses, but not in the actual organic chemistry course. Similarly, there are exercises for vectors and matrices in the Precalculus course, but none in linear algebra. Can this be resolved please? The courses have been left underdeveloped for a long time now. Thanks!