please how i can use \usepackage{csvsimple} ?

i have ph.csv and 3 head in csv file:
n - name - num

and add :

\newcommand{\subject}{
  \onecopy{1}{    

    \noindent{\bf AutoMultipleChoice  \hfill TEST}

    \vspace*{.5cm}

    \begin{center}\em
      Pre-filled test.
    \end{center}

    \hfill \namefield{\fbox{    
        \begin{minipage}{.5\linewidth}
          Name:

          \Large\bf \name{} \surname{}

          \vspace*{1mm}
        \end{minipage}
      }}

    \noindent\hrulefill

    \vspace{1ex}

    \shufflegroup{general}
    \insertgroup{general}

    \AMCassociation{\id}
  }
}

and add this code in the after beign{docum}:

\csvreader[head to column names]{students.csv}{}{\subject}

but i don't got any thing!