Make sure you know EVERY point listed on
this page. Also included in there is a practice exam, some exam notes, a sim lab, challenge tests, exam sim software, and practice tests. All Cisco certified.
Know everything in there well enough to write a book about them.
Did you go through the
Academy? If so, go back in there and read through all the curriculum again. If you bought the books, re-read them. Do the practice questions/quizes at the end of each chapter. (the first semester should be VERY easy.. you should be averaging 90-100% on all quizes/tests. Anything you miss on those quizes, study extra hard.)
The academy training is built sem1 is required for sem2, etc. That means you should have an excellent understanding of sem1, a very good understanding of sem2, a good understanding of sem3, and an ok understanding of sem4.
Another good resouce is google. Google for "CCNA practice exams" or "free CCNA study guides". Should get you some free practice exams and study guides.
If possible, try to get some quality router time where you can sit and play w/ the routers -- reconfigure them into every formation you know how.