Damo,
DD is finishing her OAC's. She is going into business so only took 2 maths - Calculus and Finite. She also took Biology. She did not write the Descartes. She has a 91, which for some universities was great but for Laurier was just good. It did get her a scholarship for Laurier although not as high as others and it guaranteed her her choice of residence style. I think PoohBWV could answer this better as her daughter is going into math and won the President's Centennial scholarship (a great accomplishment). The entrance scholarships are based solely on marks and do not need to be applied for, they are offered when the student gets an offer of acceptance. But there are many more scholarships to apply for, some are based solely on marks and some are based on financial need. One thing I would suggest to your DD is to have her participate in many extracurricular activities as a lot of universities are looking at this along with marks in determining acceptance and some scholarships look at this also.
Any other questions, just let me know.
Tink42