The SAT and ACT are accepted by schools in the US, but there are a few differences between the two. Here are some differences between the SAT and ACT:
You have more time per question for each section in the SAT.
The ACT has more questions (215) than the SAT (154).
The ACT scoring system works on a scale of 1 to 36, whereas the SAT has a total score between 400 and 1600 points.
The ACT has one Math and one Science section, and the SAT has two Math sections (one with and one without a calculator).
The SAT gives students some Math formulae and diagrams (the ACT doesn't).
The ACT includes questions on geometry and trigonometry.