\documentclass[landscape,a5paper]{article}
\usepackage[top=1.8cm, bottom=1.8cm, outer=1.8cm, inner=1.8cm ]{geometry}
\usepackage[table]{xcolor}
% Inspired by Mark Wilbrow on stackexchange
% (But totally different)
% https://tex.stackexchange.com/questions/197285/classroom-seating-chart-in-tikz
\begin{document}
\section{Classical}
\begin{table}[ht]
\centering
\begin{tabular}{cccccccc}
\cline{3-6} & & \multicolumn{4}{|c|}{Teacher} & & \\\cline{3-6}\\\cline{1-2} \cline{4-5} \cline{7-8}
\multicolumn{1}{|c|}{Alphie} & \multicolumn{1}{|c|}{Bert} & & \multicolumn{1}{|c|}{Carl} & \multicolumn{1}{|c|}{Dennis} & & \multicolumn{1}{|c|}{Eon} & \multicolumn{1}{|c|}{Frank}\\\cline{1-2} \cline{4-5} \cline{7-8}
& & & & & & & \\\cline{1-2} \cline{4-5} \cline{7-8}
\multicolumn{1}{|c|}{George} & \multicolumn{1}{|c|}{Harry} & & \multicolumn{1}{|c|}{Ian} & \multicolumn{1}{|c|}{Josephine} & & \multicolumn{1}{|c|}{Kareem} & \multicolumn{1}{|c|}{Lucas}\\\cline{1-2} \cline{4-5} \cline{7-8}
& & & & & & & \\\cline{1-2} \cline{4-5} \cline{7-8}
\multicolumn{1}{|c|}{Maya} & \multicolumn{1}{|c|}{Noah} & & \multicolumn{1}{|c|}{} & \multicolumn{1}{|c|}{} & & \multicolumn{1}{|c|}{} & \multicolumn{1}{|c|}{}\\\cline{1-2} \cline{4-5} \cline{7-8}
& & & & & & & \\
\end{tabular}
\end{table}
\section{Distributed}
\begin{table}[ht]
\centering
\begin{tabular}{ccccccc}
\cline{3-5} & & \multicolumn{3}{|c|}{Teacher} & & \\\cline{3-5}\\\cline{1-1} \cline{3-3} \cline{5-5} \cline{7-7}
\multicolumn{1}{|c|}{Alphie} & & \multicolumn{1}{|c|}{Bert} & & \multicolumn{1}{|c|}{Carl} & & \multicolumn{1}{|c|}{Dennis}\\\cline{1-1} \cline{3-3} \cline{5-5} \cline{7-7}
& & & & & & \\\cline{1-1} \cline{3-3} \cline{5-5} \cline{7-7}
\multicolumn{1}{|c|}{Eon} & & \multicolumn{1}{|c|}{Frank} & & \multicolumn{1}{|c|}{George} & & \multicolumn{1}{|c|}{Harry}\\\cline{1-1} \cline{3-3} \cline{5-5} \cline{7-7}
& & & & & & \\\cline{1-1} \cline{3-3} \cline{5-5} \cline{7-7}
\multicolumn{1}{|c|}{Ian} & & \multicolumn{1}{|c|}{Josephine} & & \multicolumn{1}{|c|}{Kareem} & & \multicolumn{1}{|c|}{Lucas}\\\cline{1-1} \cline{3-3} \cline{5-5} \cline{7-7}
& & & & & & \\\cline{1-1} \cline{3-3} \cline{5-5} \cline{7-7}
\multicolumn{1}{|c|}{Maya} & & \multicolumn{1}{|c|}{Noah} & & \multicolumn{1}{|c|}{} & & \multicolumn{1}{|c|}{}\\\cline{1-1} \cline{3-3} \cline{5-5} \cline{7-7}
& & & & & & \\
\end{tabular}
\end{table}
\clearpage
\section{Science / Lab}
\begin{table}[ht]
\centering
\begin{tabular}{ccccccccc}
\cline{3-7} & & \multicolumn{5}{|c|}{Teacher} & & \\\cline{3-7}\\\cline{1-4} \cline{6-9}
\multicolumn{1}{|c|}{Alphie} & \multicolumn{1}{|c|}{Bert} & \multicolumn{1}{|c|}{Carl} & \multicolumn{1}{|c|}{Dennis} & & \multicolumn{1}{|c|}{Eon} & \multicolumn{1}{|c|}{Frank} & \multicolumn{1}{|c|}{George} & \multicolumn{1}{|c|}{Harry}\\\cline{1-4} \cline{6-9}
& & & & & & & & \\\cline{1-4} \cline{6-9}
\multicolumn{1}{|c|}{Ian} & \multicolumn{1}{|c|}{Josephine} & \multicolumn{1}{|c|}{Kareem} & \multicolumn{1}{|c|}{Lucas} & & \multicolumn{1}{|c|}{Maya} & \multicolumn{1}{|c|}{Noah} & \multicolumn{1}{|c|}{} & \multicolumn{1}{|c|}{}\\\cline{1-4} \cline{6-9}
& & & & & & & & \\
\end{tabular}
\end{table}
\section{U-shape}
\begin{table}[ht]
\centering
\begin{tabular}{cccccc}
\cline{3-4} & & \multicolumn{2}{|c|}{Teacher} & & \\\cline{3-4}\\\cline{1-1} \cline{6-6}
\multicolumn{1}{|c|}{Alphie} & & & & & \multicolumn{1}{|c|}{Bert}\\\cline{1-1} \cline{6-6}\cline{1-1} \cline{6-6}
\multicolumn{1}{|c|}{Carl} & & & & & \multicolumn{1}{|c|}{Dennis}\\\cline{1-1} \cline{6-6}\cline{1-1} \cline{6-6}
\multicolumn{1}{|c|}{Eon} & & & & & \multicolumn{1}{|c|}{Frank}\\\cline{1-1} \cline{6-6}\cline{1-1} \cline{6-6}
\multicolumn{1}{|c|}{George} & & & & & \multicolumn{1}{|c|}{Harry}\\\cline{1-1} \cline{6-6}\cline{1-6}
\multicolumn{1}{|c|}{Ian} & \multicolumn{1}{|c|}{Josephine} & \multicolumn{1}{|c|}{Kareem} & \multicolumn{1}{|c|}{Lucas} & \multicolumn{1}{|c|}{Maya} & \multicolumn{1}{|c|}{Noah}\\\cline{1-6}
\end{tabular}
\end{table}
\clearpage
\section{Square}
\begin{table}[ht]
\centering
\begin{tabular}{ccccc}
\cline{1-5}
\multicolumn{1}{|c|}{Alphie} & \multicolumn{1}{|c|}{Bert} & \multicolumn{1}{|c|}{\cellcolor{gray} {\color{white}Teacher}} & \multicolumn{1}{|c|}{Carl} & \multicolumn{1}{|c|}{Dennis}\\\cline{1-5}\cline{1-1} \cline{5-5}
\multicolumn{1}{|c|}{Eon} & & & & \multicolumn{1}{|c|}{Frank}\\\cline{1-1} \cline{5-5}\cline{1-1} \cline{5-5}
\multicolumn{1}{|c|}{George} & & & & \multicolumn{1}{|c|}{Harry}\\\cline{1-1} \cline{5-5}\cline{1-1} \cline{5-5}
\multicolumn{1}{|c|}{Ian} & & & & \multicolumn{1}{|c|}{Josephine}\\\cline{1-1} \cline{5-5}\cline{1-5}
\multicolumn{1}{|c|}{Kareem} & \multicolumn{1}{|c|}{Lucas} & \multicolumn{1}{|c|}{Maya} & \multicolumn{1}{|c|}{Noah} & \multicolumn{1}{|c|}{}\\\cline{1-5}
\end{tabular}
\end{table}
\end{document}
