Calculus was farely easy up to the 4U level (Canadian grade 12 Calculus intended for those that want to go to university).
Granted I had done (failed it actually) in Europe grade 12 Math , btw in Europe (at least in Portugal) we have only one Math class that englobes these 3 fields: Calculus, Algebra & Geometry, Data Management & Statistics.
When I got to university (Canada), it wasn't that hard, I just didn't have any motivation to study because of personal problems, but when it came to integrals oh my was I sweating but I think that nothing like solving problems wouldn't help me understand it properly, even though the teachers at York university are very unstable, they either suck in their verbal skills (Canadian education board is at fault, including the university), or they are way too hardcore just like the second Calculus teacher that gloated that he used to teach in a German university.
Ceric, I obviously don't know your mom, but since she is your mom would she not understand your position? Afterall you only have to finish Calculus. And don't take it seriously the death warning from your mom, see it as a way from your parent to ensure that you will not goof around in university.