code: public function removeCatValue($testSessionId, $assessmentSectionId, $key)
      {
          $extendedState = $this->getExtendedState($testSessionId);
          $extendedState->removeCatValue($assessmentSectionId, $key);
          $extendedState->save();
      }
docs: Remove a CAT value from the ExtendedState.
  
  @param string $testSessionId
  @param string $assessmentSectionId
  @param string $key
  @throws \common_Exception