PLEASE HELP ME OUT

[pradeep3060]

my  program has 4 semesters i.e 4x4=16 months( 2 academic year) long
now when i'll get a visa.... it will be of how much duration (how many months).....
and my program has a 4 months vacation term.....which makes my program a 20 months long....
and it has a optional co-op term of 4 months after the last i.e 4th semester........and im interested to take dis 4 month co-op term.....
now if we calculate , the whole study is of 24 months in duration..........
and den once i complete my course.... when wud i get the certificate of my study from the college(within how many months) so as to apply for a postgraduate workpermit.....

PLZ TELL ME WHAT SHUD I DO TO AVOID PROBLEMS WHICH MAY OCCUR IN FUTURE.....
                                            
                                           PLZ HELP
                                          THANK YOU