OpnTab is an interactive education and reference application designed to help users learn, practice, and review a variety of topics. It offers an array of activities and quizzes in a wide range of subjects such as math, science, history, language, and more. The app provides users with a personalized learning experience and helps them to identify and fill any gaps in their knowledge. It also provides users with a variety of practice tests and exams to help them prepare for standardized tests. Additionally, users can access a library of reference materials and resources, including video lessons, articles, and other educational materials.
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