\documentclass[12pt]{article}
\usepackage{amsmath, amssymb, graphicx, array, fancyhdr, unicode-math}
\DeclareMathOperator{\Var}{Var}
\DeclareMathOperator{\sd}{SD}
\DeclareMathOperator{\Pois}{Pois}
\DeclareMathOperator{\Bin}{Bin}
\DeclareMathOperator{\NegBin}{NegBin}
\DeclareMathOperator{\sech}{sech}
% Text: Calibri, all bold
\setmainfont{Calibri}
\renewcommand{\seriesdefault}{b}

% Math: choose a math font and visually embolden it
\setmathfont{TeX Gyre Termes Math}                  % base math font
\setmathfont[FakeBold=1.9]{TeX Gyre Termes Math}    % embolden; adjust 1.6–2.4

% header
\pagestyle{fancy}
\fancyhf{}
\lhead{\resizebox{!}{2cm}{A}}
\chead{\raisebox{0.5cm}{\Huge Introduction}} % (add title text if you want)
\rhead{\resizebox{!}{2cm}{A}}
\setlength{\headheight}{2.5cm}
\setlength{\headsep}{12pt} % space between header and body

\begin{document}
\thispagestyle{fancy}


\begin{table}[h!]


\begin{tabular}{m{1.2in} m{4in}}
\centering\fbox{\includegraphics[width=1in]{images/single.png}} &

% -------------------- Single --------------
  \includegraphics[width=1in]{images/dice_one.png}
  \includegraphics[width=1in]{images/dice_two.png}

\end{tabular}

\begin{tabular}{m{1.2in} m{4in}}
\centering\fbox{\includegraphics[width=1in]{images/abstract.png}} &

% -------------------- Abstract --------------
 $S = \{1, 2\} = \{x \mid 1\leq x \leq 2 \}$

  \end{tabular}

\begin{tabular}{m{1.2in} m{4in}} 
\centering\fbox{\includegraphics[width=1in]{images/question.png}} 
&

% -------------------- Question --------------
\includegraphics[width=1in]{images/dice_two.png}
  \includegraphics[width=1in]{images/dice_three.png}
  \includegraphics[width=1in]{images/dice_four.png}
\\ & $T = ?$
\end{tabular}
\end{table}

\newpage

\thispagestyle{fancy}  % Apply the special header only to first page

\begin{table}[h!]
\begin{tabular}{m{1.2in} m{4in}} 
\centering\fbox{\includegraphics[width=1in]{images/key.png}} 
&

% -------------------- Answer --------------
\includegraphics[width=1in]{images/dice_two.png}
  \includegraphics[width=1in]{images/dice_three.png}
  \includegraphics[width=1in]{images/dice_four.png}
\\ & $T = \{2, 3, 4\} = \{x \mid 2\leq x \leq 4 \}$
\end{tabular}
\end{table}


\end{document}
