def calculate_target_score(target_data):
    """
    Calculate target score based on given data.

    Args:
        target_data (tuple): Target data containing name, score, and other metrics.

    Returns:
        float: Calculated target score.
    """
    name, score, _, _ = target_data
    return score

# Example usage
target_data = ('verified_default', 4235.0, 51, 8303.9)
print(calculate_target_score(target_data))