\documentclass{article}
\usepackage[indivanswers]{automultiplechoice}
\begin{document}

\setdefaultgroupmode{withreplacement}

\element{choicesC1} {
  \correctchoice{CBLA1}
}
\element{choicesC1} {
  \correctchoice{CBLA2}
}
\element{choicesC1} {
  \correctchoice{CBLA3}
}
\element{choicesC1} {
  \correctchoice{CBLA4}
}
\element{choicesC1} {
  \correctchoice{CBLA5}
}
\element{choicesW1} {
  \wrongchoice{WBLA10}
}
\element{choicesW1} {
  \wrongchoice{WBLA11}
}
\element{choicesW1} {
  \wrongchoice{WBLA12}
}



\element{qgr}{
  \cleargroup{answersgroup}
  \copygroup[2]{choicesC1}{answersgroup}
  \copygroup[2]{choicesW1}{answersgroup}

  \begin{questionmult}{1}
    Random answers (2 correct and 2 wrong ones)...
    \begin{choices}[o]
      \insertgroup{answersgroup}
    \end{choices}
  \end{questionmult}
}

\element{qgr}{
  \begin{question}{2}
    Standard question...
    \begin{choices}
      \correctchoice{OK}
      \wrongchoice{W1}
      \wrongchoice{W2}
    \end{choices}
  \end{question}
}

\onecopy{5}{

  Here are the questions:
  
  \insertgroup{qgr}

}

\end{document}
