Don't worry, there might be some issue in your application due to which you are getting refusal again and again. VISA officer evaluate the application of each applicant as per the Canadian study visa laws. Hence, there is the only best way is to apply for CAIPS NOTES at "
http://www.caips.ca/ " it will cost $120 and will take around 30 days to get the details explanation report in your hand with the reason behind your rejection.
Once, you have the reasons for rejection can submit your application again in a better way and will have higher chances of getting visa approval.