Dude, everything is hard to measure.

Educational level isn't that easy to measure when you're talking about immigrants because transcripts get faked in many countries. Equally, not all educations are equal.

IQ tests (and language tests) are at least something we can measure on Canadian soil. And being able to do well on either type of test does at least corrolates with intelligence.

Anyway Canada previously relied on a points system, which including educational accomplishments. The current crisis is in part because we've been bypassing that system to import millions of people we previously wouldn't have allowed in on any basis.