College Prep 101 is another great source for all levels of college prep, from help on the standardized tests to checklists on what to pack for your first semester. It’s also an extremely well-built and easy-to-navigate site.
StudentAid.ed.gov (formerly College.gov) is the federal government’s website explaining all kinds of financial aid, including the kinds you might be eligible for, how to apply for it, and how to deal with student loans.
CollegeBoardis a fantastic site to look up colleges, test prep, financial aid information, and all sorts of articles related to college prep. It’s definitely worth clicking through. (Their college prep section is called “BigFuture”)
Peterson’s is one of the classics, and there’s a reason it’s persisted all these years. It’s a good starting place for when you’re still trying to figure out your next step. For more in-depth information, they also publish books.