I need to move the word 'Contents' to the middle of the page.

In the photo it is displayed in the left side of the page. Is it possible to move it to the middle of the page?
Here is my code:
\documentclass[a4paper,12pt]{book}
\usepackage[margin=1.4in]{geometry}
\usepackage{titlesec}
\titleformat{\section}[block]{\Large\bfseries\filcenter}{}{1em}{}
\usepackage[T2A,T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage[english]{babel}
\usepackage{tocloft}
\usepackage{setspace}
\renewcommand{\cftpartleader}{\cftdotfill{\cftdotsep}}
\renewcommand{\cftchapleader}{\cftdotfill{\cftdotsep}}
\renewcommand\cftsecfont{\large}
\title{Title}
\author{Author}
\begin{document}
\maketitle
\doublespacing
\begingroup
\let\cleardoublepage\clearpage
\tableofcontents
\endgroup
\singlespacing
\newpage
\pagestyle{plain}
\section*{Test}
\addcontentsline{toc}{section}{Test}
\section*{Test}
\addcontentsline{toc}{section}{Test}
\section*{Test}
\addcontentsline{toc}{section}{Test}
