The people manning the agency may not even know as much as some seniors in this forum. I personally always believe that a study permit application should never be done through consultants/agency. It may question your capability before the visa officers ( my personal opinion ). That may not be case in case of visitor visa which can be applied through an agent. I applied online myself. I thoroughly read many of the threads in this forum. I have not gone through your profile but assuming that you are trying for sp for some diploma you would need completely different arguments and additional facts to bolster your application. I hope you already have your medicals done as the results are valid for one year.