I have the same problem! I've changed it! I opened a dual household registration in Guangdong in order to take the college entrance examination in another place in Guangdong. The solution is: ask the police station where you bought your household registration to issue a certificate saying that you were a relative who needed a household registration to study locally before moving to Canada, and then prove that you are not an immigrant for the college entrance examination (the information about your student status from elementary school to high school is complete and legal), and submit it to the school's Academic Affairs Office for modification. That's it.