Thank you for sharing your situation and question with us.
If you are referring to a legal guardian in order to enter school, you can find some detailed information in this Admission Eligibility Requirements document.
Here is an excerpt,
You may want to contact the School Board of the school you will be attending directly for information specific to your situation.
You can also find some helpful information on this NewYouth.ca website.
NewYouth.ca is your first link for accurate, accessible and easy-to-understand information about issues important to newcomer youth and young Canadians.
I hope this information is helpful. Please let us know if you have further questions and if there is any follow up to your question/situation.