+0
I'm not sure which is correct. Feedback is appreciated.
+1
It depends on context.

boys- plural of boy

boy's - possessive of one boy

boys' - possessive of more than one boy
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Students: Are you brave enough to let our tutors analyse your pronunciation?
which one is correct boys hostel, boy's hostel or boys' hostel?

boys' hostel

Boys hostel or boy''s hostel or boys'
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Anonymous Boys hostel or boy''s hostel or boys'

What seems to be the problem? Are you unable to see Mister Micawber's answer to this question in the thread?

CJ

All the boy's efforts to climb the ladder of success were nipped.