I am a high school Junior so I can only take one. I have more experience in Chinese and my spoken Chinese is very good however, I only recently started learning characters as my first year course only taught verbal Chinese. I have studied Japanese for less amount of time but I have a real knack for it and the SAT subject test has romanji on the majority.
Should I brave the curve of SAT Chinese or go with Japanese?
Just so you know, it is romaji.
Anyway, if you are not good at japanese, I’d take Chinese. However, if you are chinese, chinese wont help so take japanese. In actuality, you should take some other test but it depends. I am guessing you are chinese so if you really want to take one, take japanese and show you went out of your sphere and tried something new. If you get 700 or more it will be impressive. In chinese, even an 800 is meh, and not even easy to get
@andyis Japanese SAT is romaji only?
I agree with the above; take the language that is not your native/heritage language.
Know that if you do that, your score is likely not going to be strong because so many heritage speakers take them and skew the curve.
Not the whole test. If you only know romaji, do not take the test.
If you only know romaji, you don’t know Japanese.
no I was correcting spelling. But I would argue it is almost 0% romaji. You should know hiragana and kanji
Take both, that’s what I’m doing.
Haha I’m Mexican-Russian actually. I was just curious. My school is about to start requiring German as a second language of instruction so I may take the German test 
life is funny that way. Anyways, thanks for all the responses guys. I will probably take the Chinese of the two, if at all. I am scrambling to get both World and US history as I’m confident about an 800 on those exams
Thanks!