Ditch conics, it doesn't come up anywhere in the first year. Volumes of revolution come up, so don't discount teaching it. You may also want to suggest to your friend to start looking at matrices. It is quite a large part of 1st year maths.
Also, people who don't do 4U maths can be disadvantaged. This is usually because unis sometimes offer an advanced course to 4U students, and not all choose to take it. However, There are topics in 1st year maths which 4U people would not have come across (eg L'Hopital's Rule, Taylor Polynomials, graphing surfaces), so if your friend is dedicated, then i'm sure it will not be a problem.