\documentclass[a4paper]{article}
\usepackage{multicol}
\usepackage[insidebox,noshuffle,postcorrect,separateanswersheet]{automultiplechoice}
\usepackage{pgffor}
\begin{document}

\def\AMCformQuestion#1{\textbf{Q #1:}}

\onecopy{1}{

  \begin{multicols}{3}\columnseprule=.4pt
    \foreach \n in {1,...,5}{
      \begin{question}{s\n}
        Question s\n{} text.
        \begin{choicescustom}
          \wrongchoice{}%
          \wrongchoice{}%
          \wrongchoice{}%
          \wrongchoice{}%
        \end{choicescustom}
      \end{question}}
    \foreach \n in {1,...,5}{
      \begin{question}{o\n}
        Question o\n{} text.
        \AMCOpen{dots=true,lineup=true}{\wrongchoice[w]{w}\scoring{0}\correctchoice[c]{c}\scoring{2}}
      \end{question}
    
    }
  \end{multicols}

  \clearpage

  \AMCformBegin
  Asnwer sheet

  \begin{multicols}{3}
    \AMCform
  \end{multicols}
}

\end{document}