My school gave us a good indicator for success in passing the NCLEX. If all your HESI tests are 900+ average, then you have a 95% probability of passing.
This to me means that your content knowledge has been steady and solid throughout your time in school.
I took the Kaplan, but in hindsight I probably would have passed it without it. However, I took the Kaplan class with the intention of minimizing my anxiety and maximizing my confidence as my HESIs have been right around 900 average as was my exit HESI exam.
I did review content by reading the Kaplan book and watching the video after the Kaplan class, but I was also surfing the internet on my second computer screen at the same time. So I can't say I really was concerned about the content.
So, I guess the bottom line is, you need to figure out how you have been doing in school and how you do on the last HESI to see if you even need any content review.
Lastly, my advice is for you to pay for the NCLEX asap, so that when you finish school, you get the ATT asap and then get a testing date asap. You can always postpone the test date, but believe me, waiting for your test date is not a calming experience.