I just took the HESI today to finish up my CSN application for Spring 2018 - and it went really well! I basically had to speed to the testing center from the CBD because I was at work most of the day.
I got a 95%: 92 in bio, 100 in A&P, 96 in math, 96 in vocab, and 94 in reading comprehension and 94 in grammar. THAT BEING SAID, if you want to get your HESI grade up, I would definitely get this book to prepare. The material in the book is largely what's on the test. I honestly was so scared of bio (I hadn't taken a real bio class in YEARS - I took BIO 251/253 over the summer), but the little short chapter in that book on bio helped SO much.
Does anyone know where we have to bring all of our application materials once the dates roll around?