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

\author{Benjamin Bertrand}
\title{Formalisation des suites - Cours}
\date{août 2020

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

\begin{document}

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

\end{document}