更改考试类别左边距的边距点

Question

我如何将左边距上的点放置得更靠左？我甚至尝试更改一些代码，exam.cls但失败了。

\documentclass[10pt,a4paper]{exam}
\usepackage[latin1]{inputenc}
\begin{document}
\printanswers

\renewcommand{\questionshook}{%
%   \setlength{\leftmargin}{0pt}%
%   \setlength{\labelwidth}{-\labelsep}%
%   \setlength{\marginpointssep}{120pt}%
%   \setlength{\labelwidth}{20pt}
}

\pointformat{/\themarginpoints}
\pointsinmargin
\setlength{\labelwidth}{2cm}

\begin{questions}
\question[3]Answer this question.

\question[3]Answer these questions.
    \hspace{2cm}\begin{parts}
        \part[10]
    Is this a question?
        \part[10]
        Is this a question?
    \end{parts}
\end{questions}
\end{document}

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