Another thing to get your hopes up is since the tunisian system is much harder than the US system, an 18/20 average is on par with 4 GPA, you don't actually need 20/20, also, the grades that will count are the ones in senior and junior year, so Bac year and Bac-1 Year, you have to make sure your global average is 18 in those two years and there isn't a single grade below 16