Authenticity of materials: Canadian visa officers attach great importance to the authenticity of visa materials, so visa materials must not be falsified; If the visa officer finds that the materials are false, your visa will be refused directly. In severe cases, you may not apply for a Canadian visa for two years or even five years. Moreover, it is important that your credibility will be reduced, which will make it difficult for you to apply for visas from other countries.
Sufficient deposits should be prepared: the adequacy of deposits is a key point for visa approval. Deposits need a certain period of savings history and the source of funds needs to be explained. Many people who apply for a Canadian visa may be refused a visa because of a small deposit. If you want to study in Canada, but there is not enough guarantee money, Canada has implemented a green channel for such undergraduates, which greatly reduces the cost of guarantee money, but it has certain requirements for students' language performance.
Ambiguous purpose: visa refusal usually occurs when applying for a tourist visa. If you apply for a tourist visa, you must state your purpose clearly. The visa officer will consider whether you are inclined to emigrate when examining your application, so if you have friends and classmates in Canada, you can ask them to provide materials from Canada, thus improving the pass rate of the visa.
Some specific study visas need to be solved. I suggest you refer to Reiteration.com. What they mainly do is to refuse to sign, and then sign again, which is more authoritative. See if I can help you find a reasonable solution. There is also some word of mouth in the embassy. My brother refused to sign it and handed it over from their home. To tell the truth, it's not cost-effective, but more expensive.