You'll want to take the SAT at least once again this year. Try to avoid Senioritis.
September:
Categorize your colleges into "safety," "target," and "reach" schools.\\
Review your transcript
Ask two teachers for college recommendations
Check to see if colleges are scheduling interviews
Determine when is the best time to submit applications for schools with Rolling Admissions
Request applications
Register for the October SAT I or II
Take SAT practice exams
October:
Take the SAT I or II
Finalize your list of colleges to apply to
If applying Early Decision or Early Action, release SAT I and II scores
Work on your personal statement. Have people critique it
Complete Early Action or Early Decision applications
Revise your resume. Add senior year activities and classes
Start filling out the CSS Profile if your college requires it for financial aid
November:
Take the SAT I or II if applicable
Meet deadlines for Early Action or Early Decision
Meet your high school's deadlines for secondary school reports
December:
Finish your applications including Teacher Recommendations and School Reports
Try to submit your applications far before the deadline
January:
Continue scholarship searches
Continue applying for scholarships and meet deadlines
February:
Request mid-year school reports be sent to colleges
Make sure your colleges have received all materials
Keep working hard in your classes
March:
Plan a fun excursion to distract yourself from the pre-notification jitters
Keep up the scholarship and final aid search
April:
Prepare for AP exams if necessary
Revisit colleges that accepted you
Review your financial aid packages; speak with the college's financial aid officers if necessary.
May and June:
Notify the college you will attend of your decision
Send the deposit to your school is necessary
Notify colleges you will not attend of your choice
Request a final transcript to be sent to the college you will attend
Thank your teachers and counselors that wrote recommendations for you
July and August:
Attend orientation meetings for your college
Work to pay for college
Read required school reading if applicable
Register for fall classes
AP scores received if applicable