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What are the six major difference between the ACT and SAT?
ACT questions tend to be more straightforward whereas on the SAT, you may need to spend time figuring out what you're being asked before you can start solving the problem.
The SAT has a stronger emphasis on vocabulary.
The ACT has a Science section, while the SAT does not.
The ACT tests more advanced math concepts.
(In addition to basic arithmetic, algebra I and II, and geometry, the ACT tests your knowledge of trigonometry, too. That said, the ACT Math section is not necessarily harder, since many students find the questions to be more straightforward than those on the SAT.)
The ACT Writing Test is optional on test day, but required by many schools. The 25-minute SAT essay is required and is factored into your writing score. The 30-minute ACT writing test is optional.
The SAT is broken up into more sections and on the ACT, you tackle each content area (English, Math, Reading and Science) in one big chunk, with the optional writing test at the end.