Khan Academy is a non-profit educational organization created in 2006 by educator Salman Khan with the aim of providing a "free, world-class education for anyone, anywhere". The organization produces short lectures in the form of YouTube videos.

Quizlet believes learning is more powerful when it’s a shared experience—connecting with others learning the same thing. Quizlet is a place where everyone can share knowledge on any subject, at any level, and gain confidence as a learner. All the content in Quizlet is created by our users and 87% share what they create or study.

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Duolingo is a free language-learning platform that includes a language-learning website and app, as well as a digital language proficiency assessment exam. Duolingo offers all its language courses free of charge.

YouTube channels:

Free video resources that provide MATH & SCIENCE help:

                                                                                               - https://www.youtube.com/@patrickjmt

                                                                                               - https://www.youtube.com/@TheOrganicChemistryTutor