Hi Dong,

That's a good question. Naturally, the SAT will try to keep providing new passages on the actual exam. If you've already seen one before, you'll have an unfair advantage on exam day, which is the last thing the SAT would allow. I don't believe they reuse passages from previous tests on the new exams, so I would say that it is very unlikely that you would see a passage that you've already read.

The SAT questions do test you on the same skills, so reading and studying each passage will allow you to see everything in the same lens and recognize what is being asked. In that regard, questions or passages could seem similar.

As Sal Khan mentions in videos, I encourage you to also conduct your own research into questions about the SAT. You may refer to the expansive informational content on Khan Academy that I have used myself: https://www.khanacademy.org/test-prep/sat

Happy Learning!