Well, IRCC requires Nigerians to provide language proficiency in English when they are applying for their student visa, even though English is their official language and is the official language of all of their formal studies. All academic institutions recognize that and do not require proof of language proficiency, but IRCC requires them specifically to provide language proficiency.
Why would we do that? Why is there that differential treatment? Do you make other countries whose official language is English provide language proficiency?