Is it permissible for a 17-year-old male student who is able to lower his gaze to attend a German language class in a mixed educational complex where some girls adhere to the Islamic dress code while others are immodestly dressed, given the difficulty of finding a private alternative for this class?

Many fatwas have been issued prohibiting co-education, but it is permissible out of dire necessity or urgent need, provided certain conditions and regulations are met. If there is no dire necessity or urgent need, then safeguarding one's religion takes precedence, and "whoever fears Allah, He will make for him a way out and provide for him from whence he does not expect."