Can I be an engineer with low scores in Physics and Calculus?

Hello dear engineers.

I have a huge question. I am a grade 12 student in Saskatchewan high school. I have been accepted to University of Saskatchewan for Engineering. It is what I would like to do in the future ( Computer/ Electrical Engineering) however. I have a a 68 in Physics at the moment and a 75 in Calculus; the rest of my marks are above 80, besides Bio. I know many people that are taking engineering and have averages above 90. I probably have the lowest average out of al those people. I find Physics hard and do not understand Physics theories. The calculation part is Ok but understanding is very hard! I am scared now that i won't be able to survive university because I also know many people that took engineering with averages of 90 and did not pass...what are you suggestions? Please help!
posted by Mary, Canada, Saskatchewan on March 15, 2013