Hello! Assuming your stepson is going to mainstream education (ie: not a bilingual school, and even then it shouldn't be much different), at 13 he should go to the College, in Quatrieme. The following year, he will have to sit his BEPC (I'm not sure, but I think it could be the equivalent of the GCSE's). Then he'll go to the "lycee" in Seconde, aged 15. At 17/18, he will sit his Baccalaureat (A levels). That's of course depending on his results, and on what he decides to do. If he wants to go to a professional school, then the options are different. hope this helps!