Gérer une écriture spécifique de titre

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\documentclass[12pt,a4paper]{article}
\usepackage[utf8]{inputenc}
\usepackage[french]{babel}
\usepackage[T1]{fontenc}
\usepackage{xcolor}
\usepackage{tcolorbox}
\usepackage{fancyhdr}
\usepackage{array}
\usepackage{calc}
% \usepackage{tasks}
\pagestyle{fancy}
\begin{document}
    \thispagestyle{empty}
    \setlength\parindent{0mm}
    \begin{center}
    \newlength{\tempalong}
    \newlength{\tempblong}
    \setlength{\tempalong}{2em}
    \setlength{\tempblong}{0.5\linewidth - 0.5\tempalong}
    \noindent
    \begin{tabular}{@{} w{l}{\tempblong}<{\dotfill} @{\hspace{\tempalong}} w{l}{\tempblong}<{\dotfill} @{}}
      Classe: & A. Scolaire: \\
      Collège:  & Prof.: \\
    \end{tabular}
    \end{center}
    \begin{center} 
        \begin{tcolorbox}[colback=white]
            \centering
            % Série $N^o$:
            % \dots\dots\dots\dots\dots\dots\dots\dots\dots
            % \dots\dots\dots\dots\dots\dots\dots\dots\dots
            % \dots\dots\dots\dots\dots\dots \dots\dots\dots
            Série \No: \\
            \dotfill{}
        \end{tcolorbox}
    \end{center}
\section*{Exercice 1 :}
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