We proof "top-to-top" (or "head-to-head"), this means that front and back of your proof will be printed so that the top of both pages share the same edge.
You would flip the proof like the page of a magazine to read the reverse side – on the horizontal axis. The illustrations below show how the front and back of your card will be orientated based on the proof.
Landscape file
(long edge across the top)
Portrait file
(short edge across the top)
If there is anything in your proof is incorrect, see: There is a problem with my proof.
If you are ready to proceed, see: Approving Proof.