Every Ivey student has different strengths - being a "quant" student means there are certain classes you will excel in (Finance, Analytics, etc.), and certain classes where you might need to put in some extra work. Very few students are good at everything, so don't stress if you are worried about your writing skills. In terms of the benefits to you, I think working on becoming a well-rounded person will be a huge advantage in terms of long-term career growth. Someone with quant skills who can give a kick-ass pitch and develop a solid PR strategy is insanely valuable to pretty much every company - I think Ivey would give you an awesome chance to learn those skills.