Are you looking for a high school with an IB program to qualify him for a Canadian university? If so, look at http://www.ibo.org to find schools in Guayaquil and Quito. Or do a Google search on international baccalaureate guayaquil
Does your son speak Spanish? While there may be some classes given in English, the bulk of the curriculum will be in Spanish — especially in university. I am unaware of IB designation being given to universities, but there are several universities in Guayaquil. Again, he’ll struggle if he is not fluent in Spanish.
Also, be aware that the word collegio in Spanish means high school.