Of course you don't have to answer all questions Take a look at some raw scores converting table and you will find out that you can skip a lot of questions and still get high score.
Quoted directly from the College Board website, regarding the SAT Physics Subject Test:
"Please note that this test reflects what is commonly taught in high school. Due to differences in high school classes, it’s likely that most students will find questions on topics they’re not familiar with. This is nothing to worry about. You do not have to get every question correct to receive the highest score (800) for the test. Many students do well despite not having studied every topic covered."
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