Peterson's
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Peterson's has been publishing test prep materials since 1966, built on decades of data about what appears on standardized exams. The platform now offers SAT, ACT and AP courses alongside graduate school prep for the GRE and GMAT. That span covers almost every major exam a North American student will encounter from high school through graduate admissions.
The long track record means Peterson's question banks reflect real exam patterns across multiple years. For high school students, the SAT and ACT courses include practice tests that closely mimic the actual exam pacing and difficulty. For graduate students, the same rigor applies to advanced material, making Peterson's a solid fallback if you want a traditional, established resource.