A4_LinedPaper.tex

\documentclass[12pt, a4paper]{article}
\usepackage[top=1cm, bottom=0cm, left=0cm, right=0cm]{geometry} % set margins
\usepackage[utf8]{inputenc}
\usepackage{hyperref} 
\hypersetup{pdfpagemode=UseNone} % hide bookmarks when we open the pdf
\setlength\parindent{0pt} 
\pagenumbering{gobble} % delete page number
\usepackage{pgffor} % use \foreach command

\newcommand{\repeatn}[2]{\foreach \n in {1,...,#2}{#1}}

\begin{document}

\repeatn{\rule{\textwidth}{1pt} \newline}{55}

\end{document}