Need Help with this song reggae song i can't remember

by Demi
(kingstone jamaica)

It's this really old song and i can't remember the name or who it's by but I do remember one part and its the chorus "After you mama send you go a school fi get you education boy, you put gun thing first mix up in the devil get your self inna trouble boy, next thing you wnant a di earth, after you mama send you go a school get you education girl you put boyfriend frist ..' thats all i remeber do you know what song and who its by this is ?