People often call the gaokao 'China's SAT'. The comparison is understandable — both are standardised tests taken at the end of secondary school — but it hides most of what makes the two systems feel so different to the students sitting them.
The SAT and ACT are aptitude-style tests of reading, writing and mathematics. The SAT is now taken on a computer, is section-adaptive and is scored from 400 to 1600; the ACT reports a composite from 1 to 36. Both are offered several times a year, students can retake them, and many US colleges let applicants submit their best result. The gaokao, by contrast, is a set of subject exams — Chinese, mathematics, a foreign language and electives such as physics, history or chemistry — sat once a year, in early June, over two to four days depending on the province.
Content is the biggest practical difference. The SAT deliberately avoids testing a specific curriculum. The gaokao tests the whole senior high school syllabus in each subject, from classical Chinese texts to electromagnetic induction. Preparing for it is less about test-taking technique and more about three years of content mastery, followed by an intense final year of revision.
The role of the score is different too. In US admissions, a test score sits alongside grades, coursework, essays, recommendations and activities, and many colleges have been test-optional in recent years. In China, for most students, the gaokao score — or more precisely their rank within their province — is the main thing that decides which university and major they enter. There are special programmes that add interviews or university tests, but they apply to a minority.
Scale and stakes follow from that. Because there is one sitting a year and the result largely determines admission, a bad day cannot simply be fixed next month. A student who wants another try usually has to repeat a whole school year (复读). This is the single biggest reason the gaokao carries such weight in Chinese family life.
The scoring scale is not comparable either. A typical gaokao total is 750 points, but some provinces use different totals, and a raw score only means something next to other candidates in the same province and the same subject group. There is no meaningful conversion from a gaokao score to an SAT score.
If you are comparing the two for a student who might do either, the useful question is not 'which is harder?' but 'which system fits this student?' The gaokao rewards sustained, curriculum-wide preparation and holding your nerve on one occasion. US admissions reward a broader profile built over years. Both demand a lot; they simply demand different things.