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https://www.khanacademy.org/

The success and popularity of the Khan Academy are testimony to just how bad the quality of teachers at many public high schools is. The Khan instructional videos on Algebra, Geometry, Trig are clear, explained well and easy to understand - by contrast, many high school teachers of these subjects barely understand them and often confuse and frustrate their students in their attempts to teach these subjects. Of course, there's no substitute for adequate, stringent testing at school but the Khan Academy is a high-quality, free online tutor for any student struggling with high school math (and other subjects too). One of the most worthwhile uses of the Internet I've seen.

...the Khan Academy is a high-quality, free online tutor for any student struggling with high school math (and other subjects too). One of the most worthwhile uses of the Internet I've seen.

Well said!

My wife just completed "College Math", her final course requirement for her degree via Liberty University-Online. She had not taken a math course in over 45 years and was quite apprehensive. Khan Academy was invaluable!

Thankfully, her professor also encouraged the use of spreadsheets such as MS Excel or OpenOffice Calc. Through lessons from the YouTube channels ExcelIsFun and Mr. Excel, Mrs. BwanaNdege is now as big a fan of spreadsheets as I.

Thanks & praise to Sal Khan and his team for developing Khan Academy and promulgating it freely and to Bill Gates for one of his must valuable philanthropic endeavors.