Here's a great site for educational videos, lessons, and games for K-12.
"Kids learn best by 'seeing' and 'doing'" This site is full of great videos related to physical science, life science, human body, earth and space, geography, social studies, history, math, english, and some fun videos. There are other optional activities such as quizzes, worksheets, games, and puzzles relating to each topic. There is even the option of creating a new quiz game--wouldn't that be a great way for your student to show what she/he knows? It looks like a wonderful site to bookmark.
I came upon this great site, through reading a colleague's blog. Check out http://www.neok12.com/ and see for yourself! It's FREE!