However, having said the above, i am not aware of how you presented your case. I have known people who believed that their case was strong but it wasn't and hence they were refused. If you are one of them then probably a weak case wont get you anywhere with the Canadian Embassy. However if you have missed providing all the relevant details about your source of income and the relevant documents then there might be a chance. Also, I have noticed that only those people were accepted who were academically really bright and have 7+ in their IELTS. Even though IELTS is not required, giving it and having a great score increases your chances of approval. Furthermore, a reputable University will also improve your chance of getting approved since it is difficult to get an admission in a good University like UWaterloo or UofT therefore the visa officer will think that you are a bona fide student. The following is what i learned when i applied and it may come in handy to anyone else who might be applying:
http://www.cic.gc.ca/english/information/applications/student.asp
You can get the document checklist and the required forms for Pakistan here^
Requirements of embassy for study permit....
1.canada application form( 4 forms available on net) update: Number of forms may have changed since i applied so use the above link to know how many are required now.
2.statement of purpose (sop, write 2-3 pages)update: Be very convincing and convince the VO that you are a genuine student who has the necessary sources to fund his education and write about your goals and objectives after completing your education and link them with returning to Pakistan.
3.acceptance letter from university
4.offer letter from university
5. Evidence of fee paid to university. Update: Will help your finances.
6. Ielts photocopy ( must be notarized from notary public)
7. All educational documents photocopy (attested from hec, ibcc, and notarized from notary public )
8. Bank statement( original documents of bank which shows ur details of account and it must be sixth month old account)
9.source of income( mostly show property of 2-3 crore or above,)
10. Family registration certificate (FRC from nadra) original
11.police clearance certificate original
12. Polio certificate original
13. Ur nic and ur father mother nics photocopy and must be notarized
14. Ur original passport and all pages of it photocopy
You need to show a minimum of: tuition fee for the first year plus 12000 cad as proof of funds but the more the better. It would be highly recommended to pay the tuition fee for the first semester/year upfront as it would make your case pretty strong. Make sure the University has a 100% refund policy in case of a refusal.
Make sure to state your purpose and future plans in your SOP like what will you do with your education back here in Pakistan and also makes sure to show ties with your home country (properties, investments, ties with family members etc) that will compel you to leave Canada at the end of your stay. These two are the common reasons of refusal so you have to work on these.
Also check this website:
https://www.canadavisa.com/canada-immigration-discussion-board/forums/international-students.2/
If you have any query, you can ask here as well. This forum helped me a lot when I applied. I hope this information helps you.