WHY DO BANKS DEMAND FOR AN INTERNAL GURANTOR B/EXECUTIVE B4 TAKING IT STUDENTS

I am an OND graduate from YABATECH , i studied Business Adminisrtation & MGT.All banks i have submitted my IT letter to are requesting for an Internal guarantor who must be a management staff of these bank.this is really frusrating as i dont know any body in these banks.
i need help. if there any one who know any reputable company where i can do my IT

Please house help on this issue. BABADY not you only they did such thing to me also. God will provide your way for you, very soon you will laugh for suceed and success.