If you're strong in maths and English, it shd not be a problem. but do read up more on SAT questions. cos its different from our english/maths exams papers. (the format and the type of qns asked)
SAT maths qns are more of like sec sch E-maths qns. More of problem solving rather than abstract stuffs. As for the english component, u'll have to read up n improve ur vocab.
Do try the SAT past yr papers to familiarise urself with the format.
SAT 
Linear Mode
