\begin
Discover why 18 million people worldwide trust Overleaf with their work.
% Document écrit par 'SIFI Khedidja'(sifikhedidja@gmail.com)
% Compilé avec XELATEX // Compilez deux fois !
\documentclass[12pt,a4paper,landscape]{article}
\usepackage[margin=3cm]{geometry}
\usepackage{pgfornament}
\usepackage{polyglossia}
\setdefaultlanguage{arabic}
\setotherlanguage{french}
\usepackage{tikz}
\usetikzlibrary{calc}
\setdefaultlanguage{arabic}
\newfontfamily\arabicfont[Script=Arabic,Scale=1.1]{AlManzomah}
\newfontfamily\arabicfontt[Script=Arabic,Scale=1.28]{AlBattar}
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\begin{document}
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\node at ([shift={(0,-5.5)}]current page.north) {\scalebox{-1}[1]{\includegraphics[width=3cm]{Fleurs} }\includegraphics[width=8cm]{Certificat.png}\includegraphics[width=3cm]{Fleurs}};
\end{tikzpicture}
\vspace{5.5cm}
\centering
\Large
\arabicfontt{\color{black}يسر الأستاذ(ة):}
\arabicfont{\color{magenta}اسم الأستاذ(ة)}
\arabicfontt{\color{black}أن يمنـح للتلميذ(ة):}
{\arabicfont{\color{magenta}اسم التلميذ(ة)}}
\arabicfontt{\color{black}هـذه الشهادة }
\vspace{.8cm}
\RL{\textit{\color{black} عرفانـا وتقديرا لأخلاقـه(ـا)العاليـة و امتيازه(ـا)في مادة }
\arabicfont{\color{magenta}الرياضيات}
\arabicfontt
\vspace{.8cm}
\RL{\textit{\color{black}مع أطيب التمنيـات بدوام التفـوق}
\vspace{1.2cm}
\arabicfontt{\color{black}الإمضـاء:}
\hspace{9cm}
\arabicfontt{\color{black}حررب:
............
في:
..........}
\end{document}