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

\author{Benjamin Bertrand}
\title{Fonction Exponentielle - dérivation et étude de signe}
\date{décembre 2020}

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

\setlength{\columnseprule}{0pt}
\setlength{\columnsep}{0.5cm}
\setlength{\multicolsep}{6.0pt plus 2.0pt minus 1.5pt}

\pagestyle{empty}

\begin{document}

\setcounter{exercise}{6}

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

\end{document}