This Data Byte presents a summary of findings among students in the 2020 ACT-tested graduating class, over 225,000 of whom took the PreACT® test before taking the ACT® test. Five findings are highlighted: (1) PreACT-tested students scored higher on the ACT test; (2) Average gain from the PreACT to the ACT varies across subjects; (3) Average gain from the PreACT to the ACT increases with course rigor and performance; (4) Average gains from the PreACT to the ACT are lower for underrepresented racial/ethnic groups, but much of the difference is explained by course performance, rigor, and school characteristics; and (5) Average gains from the PreACT to the ACT increased with family income level, but much of the increase is explained by course performance, rigor, and school characteristics.