Kaplan is an Official Teaching Partner of the ACT. Kaplan’s ACT Prep Plus 2025 has the detailed subject review, practice tests, and expert strategies you need to be prepared for test day. This ACT prep book includes hundreds of practice questions, 4 online practice tests, and video lessons from our experts to help you face test day with confidence. Kaplan's books and practice questions are written by veteran teachers who know students—every explanation is written to help you learn.