Choosing between the SAT and ACT means understanding what each test actually looks like now, not the version that existed a few years ago. The digital SAT has its own dedicated breakdown -- here's the ACT's own 2025 redesign in the same depth.
The core structure: three required sections, about 2 hours
The Enhanced ACT's required core is linear, not adaptive -- every student sees the same question difficulty regardless of how earlier questions went, unlike the digital SAT's module-based adaptive design. The three required sections:
- English: 50 questions, 35 minutes
- Math: 45 questions, 50 minutes
- Reading: 36 questions, 40 minutes
That's 131 questions in roughly 2 hours total for the required core -- a real reduction from the ACT's older, longer format.
Science is now genuinely optional -- and doesn't touch your composite
This is the single biggest structural change. Science is a separate, optional add-on: 40 questions, 40 minutes, at an additional $4 cost. Skipping it gets you a shorter test day and a fully valid, college-reportable score -- it's not a partial or lesser score for having opted out. If you do take Science, it still generates a separate STEM score (combined with Math), but as of the September 2025 rollout, Science no longer factors into the main Composite score at all -- the Composite is now just the average of English, Math, and Reading.
The rollout wasn't instant
The new Composite scoring didn't apply to every test-taker on day one: it rolled out first to students testing online on national Saturday dates in April, June, or July 2025, with all other test-takers moving to the new system starting September 1, 2025. If you're looking at an older ACT score report or an article written before that date, the scoring structure it describes may not match the current one.
What this means for you
- Decide whether Science is worth it to you specifically -- it costs $4 more, adds 40 minutes, and no longer affects your main Composite score at all. It only matters if a specific program or your own self-assessment cares about the separate STEM score.
- Expect a linear test, not an adaptive one -- every section presents the same difficulty regardless of your performance on earlier questions, a real structural difference from the digital SAT's adaptive format.
- Check which scoring system your actual test date uses -- the Composite-without-Science system wasn't universal until September 2025, so confirm current mechanics rather than assuming an older description still applies.
- This is one half of the SAT-vs-ACT decision -- see the full comparison of who tends to do better on which test for how this format actually compares to the SAT's.