High school hlp! What should I do,,,, be logical please and Thank s?

I am an American, moved to syria when i was in 6th grade, i am in 12-13th grade atm, but i dont really want to High School in Syria ( i already did 11th and 12 grade) i ped to 13th grade, the year where i make my future, but in syria the 13th is really crappy, hard, and useless ( you would know what i am talking about if u knew syria ) it is called bakaloria if u guys wanna know more about it, the year which decides what i study, and when i mean hard i mean IMPOSSible, PLUS no only is it hard but for example if i wanna get a grade for being a doctor i need to get like 289 ( minimum ) out of 2 9 0,,,,, ( remember that it is REALLY hard!), i dont really know how life is in america ( cause i moved here when i was so small). The main question is, what should i do, i dont have to do it in the US, any other place like the Uk, i heard of the GED, but it seems that is for Adults,,, and i am 16 lol, i really need help,,, thanks ( i will not do it in syria so dont even think about it), and is there any other thing i could study or take a test in , like a Americans High school for foreigners, ty again