Hi Yaman,
By default Windows Store apps will be saved in the following location.
C:\Program Files\WindowsApps
Hence, it is not possible to move Windows Store apps to SD card.
I would suggest you to delete the unnecessary files from the computer and check if it improves in memory.
http://windows.microsoft.com/en-in/windows/delete-files-using-disk-cleanup#delete-files-using-disk-cleanup=windows-8
You may also get in touch with the manufacturer to increase the memory.
Hope this information helps. If you have any concerns, please let us know.
This answer works great, if you are using a desktop, or even a laptop.
Unfortunately, it doesn't really apply to a tablet. Windows Phone 8.1 has this capability and it is AWESOME! WP8.1 also has a Swype alternative which annihilates Swipe, but I'm getting off topic.
I'll update this post once I figure out a registry hack. 😊
Until then, have a great day! 😉