SAT Chem vs NCEA Lvl 3

Hi, how similar is SAT Chemistry to NCEA Lvl 3 Chemistry?

It’s pretty chill. It contains things that aren’t in the CIE/NCEA syllabus but the subject tests revolves around observations and memorisation. You can see the syllabus here: https://sat.collegeboard.org/practice/sat-subject-test-preparation/chemistry but I’d invest in a Barron’s textbook or check out the Sparknote guide. Shouldn’t be too much of a stretch.