Classroom

• Academic Group (USA)
  More than 38 years of service to the needs of the academic, business and professional communities, we have written, researched and edited over 50,000 documents in all fields. Our clients come from all over the United States and the world.

• Khan Academy (USA)
  The Khan Academy is a not-for-profit 501(c)(3) with the mission of providing a world-class education to anyone, anywhere. We are complementing Salman's ever-growing library with user-paced exercises--developed as an open source project--allowing the Khan Academy to become the free classroom for the World.

• MIT Online (USA)
  Free lecture notes, exams, and videos from MIT. No registration required. MIT OpenCourseWare (OCW) is a web-based publication of virtually all MIT course content. OCW is open and available to the world and is a permanent MIT activity.

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