Math
https://collegemath.files.wordpress.com/2009/07/mf-15.pdf - online MF15 for easy ref hahaha
Chemistry
http://www.chemguide.co.uk - super useful! It was my go-to whenever I couldn't understand what was taught in school hahaha
http://www.chembuddy.com/?left=pH-calculation-questions&right=pH-of-mixture-q1
http://www.sparknotes.com/chemistry/acidsbases/phcalc/section1.html
Biology
http://highered.mcgraw-hill.com/sites/dl/free/0072437316/120060/ravenanimation.html - "View full color, dynamic animations to help you visualize key biological processes.
You have the ability to control the animation by turning on or off the narration,
playing the animation with or without text, and can start, stop, or rewind the animation to any point you choose."
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General Paper (GP)
http://unpan1.un.org/intradoc/groups/public/documents/APCITY/UNPAN002726.pdf
http://www.nytimes.com/2008/02/18/technology/18link.html?_r=1&ex=1361163600&en=7e1482fcbf01bc65&ei=5088&partner=rssnyt&emc=rss
Technology was a common essay question topic so yup haha hope all these are useful to you if you happen to find this page!! :)