female teacher

Q: I am a tuition teacher of 22 years old. I also maintain purdah. 7 months back I left a tuition because of intermingling. I told them about segragation and I told them to separate my room. They did but maybe they were not happy with me. My conversation was not so much with the male members of the family but I left just for the sake of purdah. They said to me that I cannot do anything in life with this purdah. With a heavy heart I left the tuition. Now I am teaching in my home totaly separate. Am I doing the right thing?

Q: What is the ruling about studying from a video lecture that is being taught by a female instructor? Also what about a lecture which has got a background music?

Q: My friend's aunt teaches in a school. She wears niqaab. She teaches girls but some times she has to interact with males. She wears her niqab and talks to them. Is it permissible, and is the work halal as she needs to work? 

Q: My son is studying in grade 6 in a boys class but all teachers are female. From grade 7 they are taught by male teachers as per school's rules. He is 12 years old. Please guide as to how can he avoid looking at female teachers in such a situation?