#4 Females are not appointed in our college.
***** NOT A TEACHER *****
Maybe you mean something like: "Females are not allowed to enroll in our college."
If you do, then maybe it would be more diplomatic to use an affirmative sentence, such as:
"Our college enrolls only male students." (In other words, do NOT emphasize the exclusion of women. Refer only to the all-male policy of your college.)
Student or Learner