i have a project that consist of a student database. it includes saving students name, their characteristics, marks, subjects etc.. BUT I HAVE A PROBLEM.... when i save the subjects, its ok... but after i close it and open it, they dont show again (arent saved).... and when i have to modify a mark in a subject, all of the marks of all of the subjects of a specific student change (and the value of the variable isnt saved but their address is).... 

ITS URGENT!!! MY DEADLINE IN FRIDAY!!!

the link is:  http://paste.ofcode.org/8udDbWAZRRi5fyQc2F2Zhk