I don't know for sure, of course, but I see many negative effects that appear to be related to the overconfidence I was made to have in that period. It took me a lot of time and effort to get back on track, especially with math, and I probably didn't fully recover until I began my bachelor. Plus, I was being a real dick for some time, and this possibly made me lose some potential good friends. I don't have the counterfactual, of course, but since we don't have 10 000 smart kids to use in an actual experiment, this kind of evidence has to be taken into account. Unless you happen to have a clone army in your secret evil lab of course... ;)