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

\author{Benjamin Bertrand}
\title{Demontrastion Geometrique - Cours}
\date{2021-08-25}

\DeclareExerciseCollection[step=4]{banque}
\xsimsetup{
    collect,
}
\pagestyle{empty}

\begin{document}

\input{exercises.tex}
\setcounter{exercise}{3}
\printcollection{banque}
\vfill
\printcollection{banque}
\vfill
\printcollection{banque}
\vfill
\printcollection{banque}
\vfill

\pagebreak
\printsolutions{exercise}

\end{document}