SAT II chinese requirements

Hi so im ethnically chinese and speak mandarin at home with my family. The only thing is that i cant really read or write it but i do know pinyin. I would say that besides actually knowing and recognizing chinese characters im pretty much fluent. Ive heard you only need to be able to listen and tell what people are saying and know pinyin to do well on the exam. Would it be easy for me to get an 800 on the chinese subject test?