SAT Exam or test or whatever

[Happydude]

i found a practice test (i think it's an SAT from a previous year) and in the language section i haven't heard of like 60% of the words they use...like, they're not common. that is what im having trouble with, the math sections are rather easy, and so is the reading comprehension section (wich i scored a 7/10 in the first one, i didn't calculate the exact mark)

basically i want to know how am i supposed to remember so many words that i've never heard of before? becuase that's the only thing that is bringing me down