ANSWER:

A man is the breadwinner of the house. If he is forced to teach in a mixed class, he must lower his gaze and not chitchat or socialize with them. 

https://www.assimalhakeem.net/are-boys-allowed-to-study-at-mixed-universities-knowing-that-in-our-country-all-universities-are-mixed-2/

Can a male teacher educate group of female students?

Jobs | February 10, 2020 6:08 am
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Why is it that working in a non-Islamic bank is prohibited even when one’s job does not at all, in any way whatsoever, involved or help the bank in their practices of riba? How can things like giving/taking people cash or exchaning currency be prohibited?
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My nephew is in search of job, i have touch in film industry. If i send him there, he can get any job like spotboy,assistant director, cameraman, actor, etc… film industry income is haram, so will i b there in sin equally with him for his income?