New ACT Changes Makes Science Section Optional

Learn about how the new optional science section works on the new ACT, how it affects your test score, and how to prepare for it.

The ACT is undergoing significant changes, with the most notable being that the science section will no longer be mandatory. Starting in April 2025 for online test takers and September 2025 for paper-based exams, students will have the choice of whether or not to include the science section when taking the ACT.

Optional Science Section

The science section's transition to optional status is a major shift in the ACT's approach. Students who choose to take the science section will:

• Stay in the testing room after others are dismissed
• Have a short break before beginning the science portion
• Complete 40 questions in 40 minutes

This change provides flexibility for students while still maintaining the option for those who need it, particularly those planning to pursue STEM fields in college.

What This Means for Students

These changes offer several benefits:

• More time per question across all sections
• Shorter overall testing time (approximately 2 hours and 5 minutes for core sections)
• Flexibility to choose whether the science section aligns with your college goals
• Reduced study time requirements if opting out of the science section

Making the science section optional is a welcome change that acknowledges the reality of today's high school students. With demanding course loads, multiple AP/IB classes, packed extracurricular schedules, and looming college applications, students are already stretched thin trying to manage their time and energy.

This flexibility allows them to make strategic choices about where to focus their limited study time and mental resources, potentially leading to better performance on the sections that matter most for their academic goals. For many students, having one less mandatory standardized test section could provide much-needed relief in their already overwhelming schedules.

Should You Take the Science Section?

We recommend students be strategic about whether they take the science section. Consider taking the science section if you:

• Plan to major in a STEM field
• Want to demonstrate your scientific analysis skills to colleges
• Need a STEM score for specific college programs
• Have strong science and math skills that could boost your overall standardized testing profile

If you do choose to take the science section, be sure to allocate enough time to study for it. The worst mistake you can make is taking the science section without adequate preparation - a low science score can negatively impact your overall testing profile and STEM score, even if you perform well on other sections.

How Will Scoring Work?

The ACT will maintain its 1-36 scoring scale, but with important changes:

• Composite scores will now be calculated using only English, Math, and Reading
• Science scores will be reported separately when taken
• A STEM score will be generated using Math and Science (if taken)
• Previous ACT scores will remain valid and unchanged
• Superscoring will continue under the new format

Implementation Timeline

The changes will be implemented in phases:

• April 2025: Changes begin for online test-takers in the U.S.
• September 2025: Paper-based tests and international tests adopt the new format
• Early 2025: New practice materials and full-length practice tests will be available

For the most up-to-date information about these changes, visit the ACT Enhancements page.