Isn't it a great feeling

Congratulations to those who passed!
As far as preparation, I didn't ever buy a HESI book (to be honest I didn't know there were any!) but what I did is use my Saunder's Comprehensive NCLEX book and I just studied as much as I could. I've been doing NCLEX questions throughout nursing school and I think that helped. The HESI is comprehensive - it's meant to simulate the NCLEX and predict whether you are likely to pass or not. So you can have questions on anything, from delegating to cancer to child development, and so on.
Good luck to everyone preparing for it!