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

\author{Benjamin Bertrand}
\title{Complexes - Cours}
\date{Octobre 2020}

\DeclareExerciseCollection{banque}
\xsimsetup{
    step=2,
}

\setlength{\columnseprule}{0pt}

\begin{document}

\input{exercises.tex}
\vfill
\printcollection{banque}
\vfill
\printcollection{banque}
\vfill
\end{document}