Udemy
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Udemy hosts thousands of test prep courses from individual instructors and established training companies. Courses cover IT certifications (CompTIA, Cisco, AWS), standardized tests (GMAT, GRE, IELTS), and professional exams. Most courses include video lectures, practice quizzes, downloadable resources, and lifetime access.
Udemy works well for budget-conscious learners and those seeking diverse instructor approaches. The platform's strength is breadth and affordability, though you'll need to evaluate instructor quality on your own since courses vary widely in production and depth.