When looking at your region specific guide, you will notice that if they want original documents, they will ask for them. When they mentioned the educational documents, they do not say "Original". From my understanding you do not need originals of those. But, perhaps someone who actually went through that embassy can be more certain. Here is what it says in your region guide, which is found at this link:
http://www.cic.gc.ca/english/pdf/kits/guides/3907e.pdfNationals of Pakistan:
•Photocopies of identification cards, “Tazkira” or “Shinakhti Pass”, with certified translation in English or French.
•Original birth certificates for yourself and your spouse or common-law partner, together with certified translations into English or French. A birth certificate is normally acceptable if the registration of the birth was made shortly after the birth. The birth certificate must bear the name of the person whose birth it records, and must have been issued on the prescribed form by an official responsible for the registration of births in the municipality or district in which the birth took place.
•Original marriage certificate or “Nikah Nama” issued by an official responsible for the registration of marriages in the district in which the marriage took place and bearing the Nikah registry seal. You must also submit a certified translation in English or French. Wedding photos. Christians should provide an extract from the marriage registry or the church where the marriage was performed.
•If you or your spouse or common-law partner have been previously married, you must attach prior marriage certificates, divorce decrees or death certificates. “Statements of divorce” are not acceptable.
•Educational documents for applicant and spouse such as all educational documents and school leaving certificates•
Original birth certificates for each child included in the application form. Late registration of birth certificates are not acceptable.