Your Tab and most of all the phones don't allow you to use the SD card as internal storage. This is to prevent unauthorized access to data on the SD card by the apps. Some apps do allow you to save data or move to SD card. Open Settings > Apps and then select the app and see if you can find Move to SD option there. If so, then you can do it.
If that didn't work, then open Play Store search App2SD or AppMgr and see if you can use to transfer apps data to the SD card.
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