Similar thing happened with my when I was ~14, except it was the family desktop -- laptops were way too expensive for us back then -- and they had a lock on a power switch that led up to the computer. Learned to pick locks and got extensively lectured about why I shouldn't do things just because I can. My parents eventually gave up on trying to lock my out of the PC(after trying BIOS passwords, OS-level passwords and combination locks).

Funnily enough, I learned C when I was supposed to be studying for the baccalauréat. I'd learned programming in BASIC for a casio calculator(mainly for making games and a few solvers for things that we were supposed to solve manually in exams but that were too tedious). A friend of mine linked me to http://siteduzero.com/ (apparently it's changed to http://fr.openclassrooms.com/ recently) and I ended up not studying. That really hurt me in History, Geography and Biology(which require a lot of memorization) but otherwise I breezed through everything else.

PS: I'm not in France but in a country where the french baccalauréat is considered equivalent to the state-mandated exams(Lebanon, used to be under French mandate).