\documentclass{report}

\input{preamble}
\input{macros}
\input{letterfonts}

\title{AP Physics C Handbook}
\author{}
\date{}

\begin{document}

\maketitle
\tableofcontents
\clearpage

\part{Mechanics}
\input{chapters/mechanics}

\part{Electricity \& Magnetism}
\input{chapters/em}

\part{Advanced Topics}
\input{chapters/advanced}

\end{document}