Strategy, tips, and exam guides for the SAT, ACT, and APĀ® exams ā from a Barron's author with 20+ years of experience.
By Brian Stewart, Barron’s SAT, ACT & PSAT Author & Perfect SAT/ACT Scorer AP® World History: Modern covers more than 750 years of global change, from the Song Dynasty and the Silk Roads to globalization and climate change. You can’tā¦
By Brian Stewart, Barron’s SAT, ACT & PSAT Author & Perfect SAT/ACT Scorer The redesigned AP® Psychology course is built around five units, covering everything from neurons to psychological disorders. Below are 120 essential terms organized by unit (roughly 24ā¦
By Brian Stewart, Barron’s SAT, ACT & PSAT Author & Perfect SAT/ACT Scorer AP® Psychology has one of the more favorable score distributions among AP exams. In 2025, nearly half of all test-takers earned a 4 or a 5, andā¦
By Brian Stewart, Barron’s SAT, ACT & PSAT Author & Perfect SAT/ACT Scorer Most students preparing for the AP® African American Studies exam focus almost entirely on content, memorizing names, dates, and events across the four units. That’s understandable, butā¦
The ACT gives you no formula sheet. Every formula you need, from the quadratic formula to the Law of Cosines, has to be in your head before you sit down. After 20+ years of tutoring, I see this gap constantly.ā¦
By Brian Stewart, Barron’s SAT, ACT & PSAT Author & Perfect SAT/ACT Scorer The ACT Science section is now optional, and at most colleges you can skip it. But a handful of schools still require it in specific contexts, andā¦
By Brian Stewart, Barron’s SAT, ACT & PSAT Author & Perfect SAT/ACT Scorer Most students who struggle on the AP® Calculus AB exam don’t struggle because they skipped content. They struggle because they prepared for a different test than theā¦
A unit-by-unit AP Precalculus study guide covering all three tested units, the four free-response task types, and the three mathematical practices ā with links to all 30 free practice drills organized by topic.
Most ACT study guides underestimate the test ā especially its time pressure. This guide, built on how experienced tutors actually prepare students, walks you through every step: diagnosing your weaknesses, prioritizing your three core sections, deciding whether to add optional Science, managing pacing, and building the real skills the ACT rewards.
After 20+ years of SAT tutoring, I've watched students waste months preparing the wrong topics. This guide breaks down the 10 most frequently tested SAT Math topics, explains what each one actually requires, and links to free practice drills ā plus a score-range prioritization framework so you know exactly where to start.