https://www.khanacademy.org/math/geometry - Great website full of instructional videos on a ton of topics. This link is specifically to the Geometry section of the site, but if you explore the site, you'll find there are videos that will be helpful in your science and history classes as well.
http://www.geogebra.org/cms/en/ - Free dynamic geometry software similar to the Sketchometry app you'll see me use in class. It's available as a Chrome add-on and also as a program for Mac or Windows. I encourage you to take some time to play around with it, including looking at the drop-down menu for each tool.
http://education.jlab.org/solquiz/ - Go here to practice SOL type problems. You'll get different questions every time, and you can get immediate feedback on your answers, sometimes including explanations of how to solve the problems.