Ustādh, I know it is wrong for me to go to a mixed university, however that is my condition, is it okay for me to for example make dhikr even if I’m sinning by sitting in a mixed class?

Ustadh AbdulAziz al-Haqqan

Keep lowering your gaze and keep looking for a way out of the mixing, fast, make dua, and you can always make thikir.