There's a good app on Google Play that makes it very easy to browse and download your Calibre books via the server. I have a Galaxy Tab 2 7", so I can guarantee it works.
https://play.google.com/store/apps/d..._result#?t=W10.
I use Cool Reader on my tab, I set up Calibre (the app, not the actualy Calibre program) to automatically save books to /mnt/sdcard/eBooks, and they're all readily available when I open the reader.