\documentclass{template/homework}

\usepackage{enumitem} % Gives access to better enumeration items
\usepackage{tcolorbox} % Gives boxes
\usepackage{subfiles} % Makes subfiles easier (and you want those)

\title{MIT OCW Real Analysis}
\author{Philippe H. Zwietering}
\date{}

\begin{document}
\maketitle
\tableofcontents
\clearpage
\subfile{week1/main.tex}
\clearpage
\subfile{week2/main.tex}
\clearpage
\subfile{week3/main.tex}
\clearpage
\subfile{week4/main.tex}
\end{document}