The SAT is a predominantly multiple choice test, with the only exceptions being a written essay and ten student-produced math questions. In total, the SAT asks 67 Critical Reading questions, 54 Mathematics questions, and 49 Writing questions. Altogether, these add up to a total of 170 questions (plus the essay).
SAT questions typically increase in difficulty level throughout their sections, with the exception of passage-based Critical Reading questions, which chronologically follow their accompanying passage(s).