\documentclass[a4paper]{article}
\usepackage[T1]{fontenc}
% \usepackage{luatex85}
% \usepackage{luacode}
\usepackage[pdfform]{automultiplechoice}    

\begin{document}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\element{BioMecanica}{
\begin{question}{J2018N13}%
Question 1
\begin{choices}
	\correctchoice{correcta}
	\wrongchoice{incorrecta}
\end{choices}
\end{question}
}

%  Frenado viscoso, en funcion de la velocidad
\element{BioMecanica}{
\begin{question}{J2018N14}%
Question 2
\begin{choices}
	\correctchoice{correcta}
	\wrongchoice{incorrecta}
\end{choices}
\end{question}
}

\element{BioMecanica}{
\begin{question}{J2018N16}%    
Question 3
\begin{choices}
	\correctchoice{correcta}
	\wrongchoice{incorrecta}
\end{choices}
 \end{question}}

\element{BioMecanica}{
\begin{question}{J2018N17}%    
Question 4
\begin{choices}
	\correctchoice{correcta}
	\wrongchoice{incorrecta}
\end{choices}
 \end{question}}

\element{BioMecanica}{
\begin{question}{J2018N18}%    
Question 5
\begin{choices}
	\correctchoice{correcta}
	\wrongchoice{incorrecta}
\end{choices}
 \end{question}}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\onecopy{1}{    
\namefield{%
		\vbox to 4cm{
		\hbox to 6cm{\hfill	{UNIV. ID NUMBER}\hfill}
        \hbox{\vspace{-1mm}\framebox[6cm][c]{\vspace{-2mm}\AMCcode{etu}{6}}}
        }
		\hbox to 5cm{\namefielddots}
   }
\insertgroup[5]{BioMecanica}
\clearpage 
}

\end{document}
