How do I get into Harvard from Canada?

There are thousands of applicants from Canada that successfully apply to Harvard and Ivy League schools each admissions cycle. It is no different than applying as an International student from any country. Getting in has a 96% failure rate. Harvard and each Ivy school have very detailed requirements on their websites and this is really not the correct venue to ask such an open-ended question. Or vague follow up questions. Typical requirements for Harvard are (4) years each of Foreign Language, English, Maths, and Science (and an advanced class in either Bio, Chem, or Physics), 3 years of History (US, Euro, elective). The typical unweighted GPA is 3.90 and the weighted GPA is 4.18. Middle 50% of SAT scores are 1460-1570 and Middle ACT scores are 33-35. Other factors include class rank, essays, recommendations, interview, extracurriculars, talent, intellectual vitality(curiosity), personal character, volunteer work, work experience, honors or awards, whether you are a legacy, development or recruited athlete, location, and they will also evaluate any other test scores you wish to volunteer like AP or IB scores, SAT II subject tests. They accept less than 5% of applicants and it is fair to say that more than 50% of applicants who have near-perfect grades and test scores are rejected (conservative estimate). If you can get passed the "clout" factor associated with Harvard, I suggest you look at any of the Top 25 colleges where you can get either the same or better level of education. Good luck.

no because if you have good marks in one subject in hight school you can learn more about the subject or subjects that you had hight marks in at hight school and you would not have togo back to hight school you can do recherch on the subject that you know or want to know or you can go back to hight school if you want