I passed my Server+ exam this morning with a score of 835. I probably skipped and marked about 5-8 questions for review and then ran out of time like always. I was a bit concerned just for that reason. Other than that, the questions were pretty straight forward.
The only study materials I used were:
Pluralsight Server+ Videos (Not too in depth)
Without higher end CompTia certs or server experience under your belt, I'd recommend picking up a book to read as well. Good Luck