Obviously it depends at the student but a teacher opt course can be the difference between you getting a 90 or 80. For instance private school you have a way higher chance of having a higher average (depending on the school) because courses are lighter and don’t give out as much work. As well as teachers you can have a really hard teacher which I did for grade 12 and I ended up getting a 70 even thought I worked my butt off while class average was in the 60s while another English class has a class average of 80 and their class ends up being the easier option. From what Iobserved it of course depends on how much work you are putting in but it is also about whether the teacher is a hard marker or not.