LearnEnglish Kids is the British Council's website for children around the world who are learning English as a second or foreign language.
https://www.youtube.com/user/BritishCouncilLEKids
BBC Learning English offers free audio, video and text materials to learners around the world. It provides multimedia English language teaching materials to meet learners' needs.
https://www.youtube.com/user/bbclearningenglish
Oxford Online English is an online English school offering online English lessons which suit your needs. You can find free English lessons and videos every week.
https://www.youtube.com/user/oxfordonlineenglish
Cambridge English: KET and PET. This includes comments on the student performances, and information on the format of the Speaking test and how it is assessed.
https://www.youtube.com/playlist?list=PLbnloEgo0noh1ZAg-MRy-ArkGiOAhNMNb