Yes; the test should be borderline impossible, and even passing the test should be no guarantee of entry.

Immigrants should be required to be sponsored by a Canadian citizen, and that individual would assume 100% financially responsible for the burden of that person; never the taxpayer. If the immigrant commits a crime, they will be deported to face the law in their country, and the sponsoring Canadian would face prosecution and punishment here for their actions,.

No sponsoring Canadian willing to take the risk on you? No entry