I don't think photocopy of polio certificate is acceptable .. It is checked at Pakistani airport first and then at Canadian airport,,and here even they will create problem,,I saw some passengers having problem at airport when I went to see off my brother at Jinnah International Airport in October 2014..Its better to apply for NICOP before going out of Pakistan ,, but as your passport will expire in september 2015 ,,so better u go Canada ,get your PR card , and renew your passport with your CNIC as it has long validity..u have to make NICOP when your CNIC is going to be expired..But u can make NICOP any time ,,its not true that if u have canadian passport then u can apply for NICOP ( my husband got NICOP in june 2014 and he is Permanent Resident ),, NICOP will be issued by NADRA OFFICE in Canada ,,not by Canadian office..Yes this might be true that at time to apply for Canadian passport u need to make NICOP first ..AND PLEASE DONT CHANGE YOUR SIGNATURE IN NICOP ,,THEN U HAVE TO CHANGE IT IN YOUR PASSPORT AS WELL WHEN IT EXPIRES..It might cause problems for you specially in early days of your immigration..when your PR is matured ,,then u can take the risk of changing signature here and there..u are going Canada not a 3rd world country,,what is the problem if your signature is simple ??