Crash Course Science https://www.youtube.com/user/crashcourse
For all sciences. Videos detail various topics and provide animation to help with explanations Khan https://www.youtube.com/user/khanacademy
For all sciences. Videos provide tutorials working through scientific problems/questions SciShow https://www.youtube.com/user/scishow
For all sciences. Videos answer a variety of random science questions, explore topics in depth, and highlight major contributors of scientific knowledge Veritasium https://www.youtube.com/user/1veritasium
For all sciences. Videos work through common misconceptions, provide experiments to do at home, and catchy songs to help with memorization. Bozeman Science https://www.youtube.com/user/bozemanbiology/featured
Best for Biology, Chemistry, and Physics National Science Foundation https://www.youtube.com/user/VideosatNSF
For all sciences. Have topic divided into areas such as engineering, geosciences, and brain science.
Additional video channels:
NASA channel https://www.youtube.com/user/NASAtelevision
Twitter: Neil deGrasse Tyson, Bill Nye, Scott Kelly, NASA, SciShow, TedScience, science daily, Space Lab System, Orion, Ried Weisman, Chris Hadfield, ISS Research, Ames Research Station, USGS, Earthquake & Tsumanis, USGS Big Quakes
Best for Chemistry and Physics. Search through the simulations and let your teacher know which ones your find useful!
Molecular workbench http://mw.concord.org/modeler/
For Chemistry. Simulations help work through chemical concepts Evodots http://faculty.washington.edu/herronjc/SoftwareFolder/EvoDots.html
Biology. The simulator allows you to be a predator and see what happens to a population of dots over time as you select for different traits
Can you survive a million years? http://www.sciencechannel.com/games-and-interactives/charles-darwin-game/
Biology: Allows you to select a started population with a variety of trait. Then the environmental conditions change over time and your goal to have at least one of your populations survive a million years.
Specific video suggestions:
Crash Couse videos. Watch throughout the year to help reinforce content in class and for additional clarification. The following might be useful for help: (1,6,8,9,11,12,14,15,17,22,24,25,27)
Kahn Academy video lessons. The organization for Khan Academy Chemistry does not exactly follow the LHS chemistry but their units are broken down into sub-topics and can be watched and reviewed for additional help.