Are the College Board or Khan Academy practice tests for the SAT more accurate?

Test Preparation SAT Preparation
1

I seem to do a lot better (150-200 points higher) on College Board practice tests than the Khan Academy practice tests. Are the tests on Khan Academy harder than the actual SAT?

2

Both College Board and Khan websites contain the exact same 8 official College Board practice tests, 4 of which are actual prior administrations of the SAT (test #8 was administered in Jan 2017). I don’t know whether Khan has more practice tests than the official 8.

3

u could use prep books too, some are really good