Going to universities and colleges

Q: I am a 23 years old girl studying in a medical university. I wanted to ask that can I continue my studies in the medical university? Is it allowed
in Islam to get education? The university is co-education but I don't talk to any male. I go to university in proper parda so can I continue it? I have heard that a female cannot go out of home without a mahram. As I don't have a brother, or a husband nor can my father go with me so in such a case is it permitted in Islam to go?

Q: Is it permissible for a female to study away from her home town if she has a mahram take her back and forth?

Q: My sister has joined the muslim students association at natal university. They are having a national camp in Johannesburg were they will be staying for 2 nights. Boys and girls are attending. She says she will be learning about Islam etc. so it will be a good thing and she has to go for it. What can I tell her?

Q: Sending Baaligh Muslim girls to other schools for quizzes, science fairs, debates etc. with the school bus accompanied by female staff members.