The HESI, which is a sort of pre-test that is usually the gold standard of predicting NCLEX success. My schol requires that w pass te HESI with an 85% or we fail the entire RN program-regardless. You can order the HESI bood and CD or just the book. I got both, but if I had to choose, I would just get the cd as it gives you the opportunity to take the exam 5 times I think. If you are interested in learning more anout the HESI, just go to their internet page at Hesi.com. Good LucK! :-) C