\documentclass[a4paper,9pt]{memoir}
\usepackage{style}       % Custom style
\usepackage{mnfrontpage} % Front page
\usepackage{kantlipsum}  % Dummy text
\title{Mesoscale modeling of microemulsions}
\subtitle{Wonderful physics behind oil and water}
\author{Ramanathan Varadharajan}
\kind{\hfill\the\year} % Optional
\includeonly
{
    sections/abstract,
    sections/acknowledgements,
    sections/introduction,
    sections/chapter2,
    sections/chapter3,
    sections/chapter4,
    sections/appendixA,
    sections/appendixB,
}
\begin{document}
    \frontmatter        % Folios in Roman numerals, unnumbered chapters.
    \mnfrontpage
    \include{sections/abstract}
    %\include{sections/acknowledgements}
    \cleartorecto
    \tableofcontents    % Or \tableofcontents*
    \cleartorecto
    \listoffigures      % Or \listoffigures*
    \cleartorecto
    \listoftables       % Or \listoftables*
    \mainmatter         % Folios in Arabic numerals, numbered chapters.
    \include{sections/introduction}
    
    \part{The Zeroth Part}
    \include{sections/chapter2}
    
    \part{The First Part}
    \include{sections/chapter3}
    \include{sections/chapter4}
    %\include{sections/chapter5}
    \appendix           % "Chapter" is renamed "Appendix"
    \appendixpage       % Similar to \part*{Appendices}, but appears in TOC.
    \include{sections/appendixA}
    \include{sections/appendixB}
    \backmatter         % Folios in Arabic numerals, unnumbered chapters.
    \printbibliography
    \include{sections/acknowledgements}
\end{document}