Can girls study with boys in co-education systems? as now every school or college is co-education and it is a necessity to have proper education so does it make us a bad Muslim?
If it's a Muslim country, then they have to create a separate school/college for girls, if not then YES we can go to any school/college because education is more important in Islam.
After Jung-e-Badar Prophet S.A.W. announced who ever will teach to 10 children he will freed out.
Quran revealed starting with "READ" (IQRA)
Bukhari: Allah's Messenger (ﷺ) said, "He who has a slave-girl and educates and treats her nicely and then manumits and marries her, will get a double reward.