khanacademy.org 的前十大競爭對手

byjus.com

BYJU'S National Aptitude Test is a national level online exam designed to simulate the competitive feel of JEE and NEET. Register free and assess your preparations

quizlet.com

quizlet makes simple learning tools that let you study anything. start learning today with flashcards, games and learning tools — all for free.

ixl.com

IXL is the world's most popular subscription-based learning site for K–12. Used by over 18 million students, IXL provides personalized learning in more than 20,000 topics, covering math, language arts, science, social studies, and Spanish. Interactive questions, awards, and certificates keep kids motivated as they master skills.

study.com

Take online courses on Study.com that are fun and engaging. Pass exams to earn real college credit. Research schools and degrees to further your education.

coursera.org

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math.libretexts.org

The LibreTexts libraries collectively are a multi-institutional collaborative venture to develop the next generation of open-access texts to improve postsecondary education.

chem.libretexts.org

The LibreTexts libraries collectively are a multi-institutional collaborative venture to develop the next generation of open-access texts to improve postsecondary education.

udemy.com

Udemy is an online learning and teaching marketplace with over 250,000 courses and 73 million students. Learn programming, marketing, data science and more.

k12.com

Find the answers to the questions you may have about online schooling with a K12-powered school, so you can help unlock your child’s success.

tutorial.math.lamar.edu

welcome to my math notes site. contained in this site are the notes (free and downloadable) that i use to teach algebra, calculus (i, ii and iii) as well as differential equations at lamar university. the notes contain the usual topics that are taught in those courses as well as a few extra topics that i decided to include just because i wanted to. there are also a set of practice problems, with full solutions, to all of the classes except differential equations. in addition there is also a selection of cheat sheets available for download.