The permanent residence to Canada under express entry or provincial nomination is based on CRS score. Which is combination of IELTS score + your age score + your education (BS/MS) + points for work experience (outside Canada and inside Canada). The minimum band one needs to realistically have any chance is 7+ in all 4. Minimum if one has provincial nomination can be 4+ but that is quite unrealistic unless someone is already a b Canada. So I would say 7+ so that the score can be near draw levels of 460+ crs score.