Hi Ellena,
I had similar issues on screen rotation and touch being opposite. Touch issue fixed by putting TouchSetting.gt in the C:\Windows\inf directory. Rotation issue fixed by running gsensor.reg. Both files are in the Windows 10 Drivers X98 Air 3G.rar download. I assume that you have fixed all issues (! mark) in Device Manager. Display Adapter might not show an issue if it can load the default Microsoft Driver. So you can try Updating Driver there. I have no issues with Audio or Bluetooth. Check your volume setting and check bluetooth is enabled. Sorry, this part might not be helpful.
JK