Samsung Galaxy Tablet II P311X only support maximum 32GB external SD Card, Here is the solution that I make it support 64GB SDCard to store media & game files into external SD Card.
First of all the device must be rooted,
Download Paragon exFAT, NTFS & HFS+ from https://play.google.com/store/apps/details?id=com.paragon.mounter&feature=search_result#?t=W251bGwsMSwxLDEsImNvbS5wYXJhZ29uLm1vdW50ZXIiXQ..
, & format your sdcard with it as HFS, note: after format, this sdcard will no longer accessable by windows operation system with card reader directly.
Do NOT format this sdcard with the application in Android settings -> storage as this will format the sdcard into extfat format again.
After format, set the mount point & tick the auto-mount on boot.
Then install “FolderMount”,
I recommend you to go pro version as it can setup as many as mount point you want, the free version can only set 3 of them.
Then you can move any application/game folders which require large space with folder mount to safe the space of your internal SDCard