The Fraser Institute has just released its ranking of Ontario's secondary schools. It is a convenient and easily searched ranking. Click here.
As has long been the case, London's Central Secondary is near the top (ranked second of 676 high schools). Interestingly, the new catholic school on the north end of town is ranked reasonably highly for being a new school.
Also, I see that what many parents believed to be the case still holds in Clinton: St. Anne's significantly outranks Central Huron high school, which is roughly on a par with the Goderich secondary school.