The English and Writing sections are nearly identical on both tests. The main differences are in Math and Science: the SAT’s Math section is almost 50% of the test, covers fewer topics, and can be trickier. In contrast, the ACT’s Math section is about 25% of the test, covers more topics, and is more straightforward but challenging. Additionally, the ACT includes a Science section, which the SAT does not, and some students may find it difficult.