Leaving SAT II Completely Blank

Tomorrow I have three SAT IIs, one of which is US History. I highly doubt my ability to score above 700, so I was thinking about leaving the answer sheet blank so my score doesn’t count. My plan is to start by circling answers in test book, and then filling out the answer sheet itself only if I think I did well. Is this a good idea?

Just leave after the 2nd subject; just because you signed up for it does not mean you are obligated to take it. Alternatively, take the test and you may surprise yourself.