I scored an 842, which is honestly higher than I expected. The study materials I used were the CompTIA Server+ All-In-One Exam Guide by Daniel Lachance, the Pluralsight video courses and the Transcender practice tests. What's worked best for me with certifications is to have multiple different sources of information. For instance a textbook, videos, and practice tests. I've worked a lot of lower level IT jobs over the past 15 years, including a brief stint in a data center, and I think that experience combined with my previous certs helped.
The test material was really broad. Even with the different sources of information I used, I still came across questions that I was unfamiliar with. Really take your time. I flagged several questions and finished them at the end. Sometimes you have to really think about what they're asking you. I finished with less than 5 minutes left on the clock, so my best advice would be to really know the material and be aware of the time, but don't rush. I studied for a little over a month before I took the test. Perhaps 5 weeks. Glad to have this one behind me now.