I'd say its adequate,I have a question about this program as well.
Right now, I am debating between EngSci or Math&CS at the University of Toronto.
My plan is to go to engsci and transfer out to math in second year, because I am pretty sure that I won't like it.
However, I want to give it a try for the learning experience and such.
My question is whether the math and computer science that we'd do in EngSci is adequate to do a Math specialist starting in second year.
take a look at engsci first year curriculem and math specialist curriculem online,
theyre pretty much the same (but Engsci covering more subjects). Engsci math is theory based, so it is suitable for math majors.
Although I would suggest that you go straight into math for the Analysis! course that U of T offers. That course is rigorously proof and challenging problems oriented, and you will be taking it with math geniuses. The course code escapes me, and I may not even be correct in its name. But look into it, such course exists.
Ofcourse, if you dont feel the need, you can have a taste of EngSci. I am already guessing that youre trying that route so you can brag about how you got in to EngSci :P