ACT Study Plan: Your 90-Day Roadmap to Higher Scores Follow a 90-day, diagnostic-driven ACT study plan built around weekly skill cycles and regular full-length practice tests. That is the single most effective approach for most high school students, and it is where you should start today. If your test is fewer than six weeks away, skip to the condensed timeline options below. Either way, your first move is the same: take a timed, full-length diagnostic before you study anything else. Your 3-step checklist to start right now: Take a timed diagnostic. Use a free official full-length practice test from ACT Test Prep to establish your real baseline score across all four sections. Set a target score. Look at the score ranges for your target colleges and pick a realistic composite goal. A meaningful composite improvement is achievable in 90 days with consistent effort. Block study time this week. Schedule at least three 45–60 minute sessions before the weekend. Treat them like class periods. Two things you can do in the next 48 hours: register for a free MyACT account to access official practice materials, and block your study sessions in your calendar for the next two weeks so they do n