Request for more videos in the Chemistry section

Hi there, I am a student of class 10th CBSE from India, I use khan academy for studying science and mathematics,the videos on khan academy are really informative, and these videos helped me alot to ace the tests and to perform good in class, but there is a problem, some lessons are missing in chemistry section, my board exams are near and I haven't studied those lessons so, I request you to please provide videos on those lessons. Thank you