\documentclass[12pt]{article}
\usepackage[a4paper, margin=20mm]{geometry}
\usepackage{graphicx}
\usepackage{float}
\usepackage{fontspec}
\usepackage{booktabs}
\setmainfont{Times New Roman}
\pagenumbering{roman}
\begin{document}
\input{title}
\section*{Disclaimers}
\input{disclaimer}
\pagebreak
\input{abstract}
\pagebreak
\begin{center}
\section*{Acknowledgements}
\end{center}
\input{acknowledgements}
\pagebreak
\input{contents}
\pagebreak
\input{figlist}
\pagebreak
\input{tablist}
\pagebreak
\section{Introduction}
\pagenumbering{arabic}
\input{introduction}
\pagebreak
\section{Literature Review}
\input{literature}
\pagebreak
\section{Methodology}
\input{method}
\pagebreak
\section{Results}
\input{results}
\pagebreak
\section{Discussion}
\input{discussion}
\pagebreak
\section{Conclusion}
\input{conclusion}
\pagebreak
\bibliography{bib.bib}
\bibliographystyle{ieeetr}
\pagebreak
\section*{Appendix}
\input{appendix}
\end{document}
