Yup, SAT can be taken preparation-less, because it is relatively devoid of subject matter content. It is approximately an IQ test. Since Korean SAT is intended

Yup, SAT can be taken preparation-less, because it is relatively devoid of subject matter content. It is approximately an IQ test. Since Korean SAT is intended to test subject matter content understanding, it doesn't work that way. Interestingly, Korean public service exam is very similar to SAT in that it can be taken preparation-less (in fact, preparation-less-ness is an explicit design goal of the test) and similarly devoid of subject matter content. Source: I took both Korean SAT and Korean public service exam.