OT: Salesforce Admin Certification

Paging all Salesforce Admins! Would you mind helping a fellow Hokie?

I accepted a new position at a software company that is built on top of Salesforce. As a result, I am currently working towards my Salesforce Admin Certification. My company signed me up for a Pro Pack course so I've been studying using that and the Trailheads. I'm approaching the end of the 6 week course and I then I can take my exam at anytime. As of right now I feel very unprepared even though I've been keeping up with the coursework.

Is anyone out there a Salesforce Admin? If so, what did you do to prepare outside of the Trailhead modules and practice test? Any tips or tricks for taking the exam? I've heard mixed reviews about taking it at home vs. going to a testing center.

Thanks in advance for your help!