LaTeX exam class extensions

% for the `exam` class
\newcommand{\xquestion}[1]{
    % Set the questionlabel to the user's choice
    \renewcommand{\questionlabel}{#1}
    \question % do the question thing
    % and reset it back to default
    \renewcommand{\questionlabel}{\thequestion.}
}
\newcommand{\xpart}[1]{
    % Set the partlabel to the user's choice
    \renewcommand{\partlabel}{#1}
    \part % do the part thing
    % and reset it back to default
    \renewcommand{\partlabel}{(\thepartno)}
}