In this website, http://www.khanacademy.org/, you can find many instructional video clips, mostly on Math and Science topics, such as how to do ‘completing the square’, how to do differentiation and integration, how to calculate the moment of a force etc.
You may also visit http://www.openlectures.org to hear lectures on A-level topics based on the Singapore syllabus.
If you learn better through watching and listening as compared to reading, then these websites might be of help to you. Happy exploring!
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