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

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

\DeclareExerciseCollection{banque}
\xsimsetup{
    step=3,
}

\pagestyle{empty}

\begin{document}

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

\end{document}