You can't really give tips on how to get an "A" (which would be a 10 and above), because it's different for each person. There are students that really don't need as much effort in order to get these kind of grades, and then there are those who put a lot of studying and time just to scrape by.
Just know that you'll have to put at least that much more effort than what you might have done for highschool. Whether that's paying attention in class and trying to understand the concepts (not just listening and letting the info go in one ear and out the other), studying from the texts or going to tutorials/help sessions.
As such; worry about it later. Get a taste of engineering, and make your own judgment. As well, don't be killing yourself if you were used to getting A's in highschool, only to strike a grade level below in university. Most people drop dramatically because of the leap in learning methods between the two. Highschool really babies a person, and I'll leave it with that.
And lastly; sleep? It depends on what you do with your own time. Consider also that outside of the schooling, you do have a social life at mcmaster too and that can be a hefty pull on your schedule (and with engineering being as it is, you'll soon realize how tight that schedule is!)
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