well if you already have been admitted to the college for their ESL program with your current score then your next step is to apply for a student permit,its up to immigration canada to decide if you should be granted a visa or not...in my opinion your score is low for studying in canada but who knows since you will be taking an ESL course.
i suggest you post this under the education stream in this forum,you should be able to get help there since most of the members are international students studying or intending to study in canada.