\documentclass[a4paper,10pt]{article}
\usepackage{myXsim}

\author{Benjamin Bertrand}
\title{Proportionnalite - Exercices}
\date{2021-11-08}

\DeclareExerciseCollection[step=3]{banque}
\xsimsetup{
    collect
}


\begin{document}
\input{exercises.tex}

\setcounter{exercise}{4}
\printcollection{banque}
\vfill
\printcollection{banque}
\vfill

\end{document}