You can move files back and forth between your Mac and your iPad over the USB cable that comes with the iPad. You do this using iTunes.
From iPad User Guide For iOS 6 Software [pdf available
here]:
Transfer files using iTunes: Connect iPad to your computer using the included cable. In iTunes on your computer, select iPad, then click the Apps button. Use the File Sharing section to transfer documents between iPad and your computer. Apps that support file sharing appear in the File Sharing Apps list in iTunes. To delete a file, select the file in the Files list, then press the Delete key.
