If you want to study in Canada & have a degree in Nigeria, request for an IELTS letter of exception/waiver from your school in 🇳🇬.
If you are looking to travel as a PR, however, you have to take an English test. Even 🇬🇧 & 🇺🇸 do too.
If it is, email the school in Canada directly and ask that they check your institution on WHED.
This will help, if you are unable to get the waiver letter from your school in Nigeria.