A summary takes the major points of a given work and restates them in a more concise format. A good summary retains the factual content and point of view of the original while being shorter and easier to read. It can often use meta-discourse to talk about the original text rather than merely paraphrasing.
In this case, the original is poorly organized, listing points rather than making its thesis clear and coherent. It would be best to begin a summary by stating the point that the original text appears to argue for: in this case, that international students are an especially valuable class of potential immigrants. It then gives two types of reasons why such immigrants are valuable. The first is their qualifications, including knowledge of Canadian languages and culture. The second type of reasons are grounded in outcomes, namely that many international students go on to make important contributions to the Canadian economy.