How do I communicate Advanced Actions and Variables between SCOs?

Technically SCO's cannot communicate with each other.

You could use localStorage in the users browser to set and retrieve the variables.

The student name should already be available from the LMS via the CP variable cpQuizInfoStudentName.

I don't have time right now to set up a local storage, but the following example is used in a course where if the user changes the volume settings, it is written to local storage so that the volume is the same across all SCOs. It not set up for CP variables though.

var courseID = "yourCourseID"+".";

function getConnected()
{
if ( window.location.href.indexOf("http") == 0 )
{
  return true;
}
else
{
  return false;
}
}

//Checks if brower supports localStorage
function supports_html5_storage()
{
if ( typeof(Storage) !== "undefined" )
{
   return true;
}
else
{
  return false;
}
}

function getVolume()
{
var thisVol = courseID+"myVolume";

if ( supports_html5_storage() )
{
  if ( localStorage.getItem(thisVol) == null || localStorage.getItem(thisVol) == 'undefined' )
  {
   localStorage.setItem(thisVol, 60);
   return 60;
  }
  else
  {
   return parseInt( localStorage.getItem(thisVol) );
  }
}
else
{
  alert("Your browser does not support local storage, your volume setting cannot be saved for this module.")
}
 
}

//function called from the main file when user changes volume settings
function setVolume( vol )
{
if ( supports_html5_storage() )
{
  localStorage[courseID+"myVolume"] = vol;
}
}