Read your email. Every day.
Be an active participant. Students, this is your future.
Ask questions and ask for help when you need it.
Complete Student Brag Sheet in SCOIR (under My Surveys in the menu at the top right)
Have a parent/guardian complete the Parent Point of View (Parent Brag Sheet) in SCOIR (can be done in student account, or student can invite parent)
Pull together the requirements for each school (e.g. types of applications accepted, deadlines, how many letters of rec, special requirements, etc. the best place to find the most current info is on the university's admission web site. Look for something like "How to Apply". Click here for the College Application Tracker, a spreadsheet you can modify for your needs)
Improve (or re-write) your main application essay. Here are some brainstorming exercises, if you need to start over. College Essay Guy (CEG) has the BEST free resources out there for essay writing, including supplements and school-specific essays (like the UCs).
Work on your activities list. I like to work in Google Docs first. Here's a great resource to help you improve your list!