Khan Academy
Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. Math, science, computer programming, history, art history, economics, and additional courses are presented in video mode available to all learners. Math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT have contributed to lesson development providing rigorous learning opportunities for students.
Explore the link to Khan Academy and study what you find interesting!