<p>SAT is not as straightforward as the ACT, meaning the SAT employs more sneaky traps and requires you to think more creatively, especially on the math.</p>
<p>SAT Critical Reading is far more dense and harder than the ACT Reading.</p>
<p>ACT has a science section, which doesn’t require you to remember bio or chem or anything, but to read charts/graphs/logically understand the experiment design. It’s not hard…but it is extremely fast-paced. 35 minutes for 40 questions including checking out the graphs/tables/experiments.</p>
<p>SAT has no science.</p>
<p>ACT Math tests more advanced concepts than the SAT, but ACT math questions tend to be more straightforward and require less out of the box thinking. ACT tests basic trigonometry, matrices, logarithms, circle equations, for example…which the SAT does not.</p>
<p>ACT English (grammar) tests far fewer grammatical concepts than the SAT Writing grammar portion. However, I heard the curve on the ACT English is much harsher than that of the SAT Writing.</p>
<p>SAT has a penalty for getting questions wrong, while the ACT does not.</p>
<p>I’d take practice tests for both, see how you do, then decide which to take.</p>
<p>I recommend PWN the SAT as a math book. Helpful for the ACT too as there is overlap, but obviously it’s not geared towards ACT Math. It’s much more easy to read (humor) and organized better than books by Princeton Review, Kaplan, etc. It also focuses on the tricks rather than just straight up math. This is important because if you already knew the mathy academic way, then you probably wouldn’t have missed the problem to begin with. PWN the SAT trains you to think creatively, just like the SAT requires you to do on the math.</p>