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

\author{Benjamin Bertrand}
\title{Exponentielle complexe - Cours}
\date{janvier 2021}

\DeclareExerciseCollection{banque}
\xsimsetup{
    step=1,
}

\pagestyle{empty}

\begin{document}

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

\pagebreak

\xsimsetup{
    step=1,
    print-collection/print=solutions
}
\printcollection{banque}

\end{document}