Work as a nursing assistant, volunteer at a hospital, read as much as you can about nursing.
Get an NCLEX review book and start studying questions, terminology now!
You'll find that studying the questions now, will help you with your exams in your clinical areas. Most courses teach/test you on questions/content you'll see on the exam.
Best wishes,
Andrew Lopez, RN
http://www.nursefriendly.com/nclex