https://itunes.apple.com/us/app/memor52card/id1243778449?l=zh&ls=1&mt=8
To sum up how to memorize playing cards:
Basically, because images are much easier to memorize than bland information, use images represent playing cards, memorize that image instead of suit and number on card.
This app can let you customize your own mnemonic images.
It’s good for someone who already know about the technique.
For someone who don’t know, there’s a brief tutorial, although you can find better one once you google it.
Welcome for any comment, hope you like it 