I am a English nurse

who hopefully will be relocating to the States (providing I pass the NCLEX) I will be taking the exam in May, and wondered if anyone out there can offer any advice on this exam. I have got the books, on line practice discs etc, but I guess its nothing like the real thing. Is there anyone out there who found the actually exam harder than the practice discs etc (or easier)? Any good tips, advice would be greatly appreciated. I really need to pass the exam first time round