Exercise

\documentclass[11pt,answers]{exam}
\usepackage[utf8]{inputenc}
\usepackage[mongolian]{babel}

% Watermark
\usepackage{draftwatermark}
\SetWatermarkText{Ноорог}
\SetWatermarkScale{5}
\SetWatermarkAngle{60}

% Dummy text
\usepackage{lipsum}

% ISBN

\usepackage[ISBN=978-9919-23-463-8,SC0]{ean13isbn}
\def\bookInfoDAA{ДАА-5.1}
\def\bookInfoNNA{ННА--32.973-018}
\def\bookInfoM{М-302}

% Copyright Info

\def\thetitle{Бодлогын хураамж}
\def\thesubtitle{Жишээ, дасгал, бодлого, бодолт}
\def\theauthor{Г.Махгал}
\def\theurl{https://www.galaa.net/}
\def\theurldesc{www.galaa.net}
\def\copyrightyear{2023}

\def\authors{\theauthor}
\def\printed{2023}
\def\copyrightyears{2023}
\def\editor{Р.Редактор}
\def\publisher{Хэвлэх үйлдвэр}
\def\pp{20}

% Foreword

\newcommand{\foreword}{
\lipsum[1-2]
}

% PACKAGES
\usepackage{amsthm,amsmath,amssymb,multirow,ifthen,comment,tikz,pgfplots,listings,subcaption,centernot,colortbl,diagbox}
\usepackage[fixed]{fontawesome5}
\usepackage[inline]{enumitem}
\usetikzlibrary{patterns,intersections}
\usetikzlibrary{decorations.pathreplacing,calligraphy}
\usetikzlibrary{angles,quotes}

% QUESTION NUMBERING
\renewcommand{\thequestion}{\bfseries\thesection.\arabic{question}}
\usepackage{etoolbox}
\patchcmd{\questions}{10.}{\thequestion.\ \ }{}{}% fix left margin

% TASKS

%\usepackage{enumitem}
\newlist{tasks}{enumerate}{1}
\setlist[tasks,1]{label=\roman*\,), leftmargin=*, itemsep=0.5\baselineskip, before=, font=, format=}
\newcommand{\task}{\item}

% ANSWERS

\newbox\allanswers
\setbox\allanswers=\vbox{}

\newenvironment{answer}
{%
  \global\setbox\allanswers=\vbox\bgroup
  \unvbox\allanswers
  \list{}{\leftmargin0em}%
  \item\relax
  \hspace{-3.5em}\makebox[3em][r]{\thequestion.}\par\vspace{-\parskip}\vspace{-\baselineskip}
}%
{%
  \endlist
  \bigbreak
  \egroup
}

\newcommand{\showallanswers}{
  \clearpage
  \section*{Бодолт}
  \addcontentsline{toc}{section}{Бодолт}
  \unvbox\allanswers
}

% Bonus
\bonuspointpoints{оноо}{оноо}
% USAGE
% \bonusquestion[5]
% \bonuspart[5]

% Solution
% DOES NOT USE
%\unframedsolutions
%\renewcommand{\solutiontitle}{\noindent\textit{Хариу}\par\noindent}

% Table and Figure Numbering
\usepackage{chngcntr}
\counterwithin{table}{section}
\counterwithin{figure}{section}

% Color
\definecolor{maincolor}{cmyk}{1,0,0,0.5}

% Listing
\lstset{
  language=R,
  basicstyle={\normalfont\ttfamily},
  backgroundcolor=\color{black!10},
  keywordstyle=\color{maincolor},
  commentstyle=\color{black!85},
  stringstyle=\color{black!85},
  breakatwhitespace=true,
  breaklines=true,
  frame=l,
  framesep=5pt,framerule=2pt,
  xleftmargin=8pt,xrightmargin=0pt,
  rulecolor=\color{maincolor!65},
  keepspaces=true,
  showstringspaces=false,
  columns=flexible,
  numbers=none,
  tabsize=3,
  inputencoding=utf8,
  escapeinside={\#}{;},
  morekeywords={in,replicate},
  otherkeywords={set.seed,data.frame,which.max,chisq.test},
  deletendkeywords={},
  deletekeywords={R,t,q,lower,by,col,scale}
}

% Enumeration
%\usepackage[inline]{enumitem}
\setlist{nolistsep}
\let\oldenumerate\enumerate
\renewcommand{\enumerate}{
  \oldenumerate
  \setlength{\itemsep}{1pt}
  \setlength{\parskip}{0pt}
  \setlength{\parsep}{0pt}
}
\renewcommand{\theenumi}{\arabic{enumi}}
\renewcommand{\theenumii}{\alph{enumii}}
\renewcommand{\theenumiii}{\roman{enumiii}}

\usepackage[ampersand]{easylist}
\ListProperties(Margin=3ex)

% Example
\newtheoremstyle{example}
{}                % Space above
{}                % Space below
{\slshape}        % Theorem body font % (default is "\upshape")
{-1.9em}                % Indent amount
{\bfseries}       % Theorem head font % (default is \mdseries)
{.\\[0.25\baselineskip]}               % Punctuation after theorem head % default: no punctuation
{ }               % Space after theorem head
{}                % Theorem head spec
\theoremstyle{example}
\newtheorem{example}{\color{maincolor}\faIcon[solid]{chalkboard-teacher} Жишээ}[section]

% url
\usepackage[hyphens]{url}
\usepackage[
  colorlinks=true,urlcolor=maincolor,linkcolor=black,linktoc=all,
  unicode=true,pagebackref=true
]{hyperref}

% Author and Title
\hypersetup{
  pdftex,
  pdfauthor={\theauthor},
  pdftitle={\thetitle},
  pdfsubject={\thesubtitle},
  pdfkeywords={},
  pdfproducer={pdfLaTeX},
  pdfcreator={LaTeX}
}

% Paper Size and Margin
\usepackage{geometry}
\geometry{
 b5paper,
 twoside,
 inner=2.75cm,
 outer=1.5cm,
 top=2.35cm,
 bottom=2.5cm,
 }

% contents to TOC
\usepackage{tocbibind}

% TOC
\usepackage{tocloft}
\renewcommand{\cftsecfont}{\normalfont}
\renewcommand{\cftsecpagefont}{\normalfont}

% Header and footer
\renewcommand\headrule{}
\lhead[\textcopyright\ \copyrightyear\ifthenelse{\equal{\the\year}{\copyrightyear}}{}{\,--\,\the\year} \theauthor]{\href{\theurl}{\textcolor{black}{\theurldesc}}}
\rhead[\href{\theurl}{\textcolor{black}{\theurldesc}}]{\textcopyright\ \copyrightyear\ifthenelse{\equal{\the\year}{\copyrightyear}}{}{\,--\,\the\year} \theauthor}
\cfoot[\thepage]{\thepage}

% Positioning
\usepackage[absolute,overlay]{textpos}
\setlength{\TPHorizModule}{1cm}
\setlength{\TPVertModule}{1cm}

% Page break in math mode
\allowdisplaybreaks

% Table
\renewcommand{\arraystretch}{1.5}
\usepackage{array}
\newcolumntype{L}[1]{>{\raggedright\let\newline\\\arraybackslash\hspace{0pt}}m{#1}}
\newcolumntype{C}[1]{>{\centering\let\newline\\\arraybackslash\hspace{0pt}}m{#1}}
\newcolumntype{R}[1]{>{\raggedleft\let\newline\\\arraybackslash\hspace{0pt}}m{#1}}

% Back Cover

\newcommand{\backCover}{
  \newpage
  \thispagestyle{empty}
  \newgeometry{left=3cm,right=3cm,bottom=3cm,top=3cm}
  \parskip=0pt
  \pagecolor{maincolor!75}
  \begin{minipage}{\textwidth}
  \color{white}
  \setlength{\parindent}{1cm}
  \setlength{\parskip}{0.5\baselineskip}
  \large
  \foreword
  \end{minipage}
  \vfill
  \hfill\colorbox{white}{\EANisbn}
}

% DOCUMENT
\begin{document}
\pagenumbering{gobble}
\thispagestyle{empty}
\begin{titlepage}
\newgeometry{left=0cm,right=0cm,bottom=0cm,top=0cm} %defines the geometry for the titlepage
\pagecolor{maincolor!75}
\color{white}
% 
\begin{textblock}{14}(5, 3.03)
\makebox[0pt][l]{\rule{0.65\textwidth}{1pt}}
\end{textblock}
% author
\begin{textblock}{14}(2, 2.35)
\begin{tikzpicture}
\node at (0.5,0.5) [rectangle, minimum width=3.5cm, minimum height=1.25cm,text centered, draw=maincolor!75, fill=maincolor!75] {\textbf{\textsf{\Large\color{white} Г.Махгал}}};
\end{tikzpicture}
\end{textblock}
% Title
\begin{textblock}{11}(2, 11)
\scalebox{1.7}{
\begin{minipage}{0.5\paperwidth}
\LARGE \bfseries \thetitle
\vskip5mm
\begin{flushleft}
\normalsize \thesubtitle
\end{flushleft}
\end{minipage}
}
\end{textblock}
% copyright
\begin{textblock}{6}(10, 22)
\begin{flushright}
\bfseries
\textcopyright\ \copyrightyear\ifthenelse{\equal{\the\year}{\copyrightyear}}{}{\,--\,\the\year} \theauthor
\hfill
\textsf{\href{\theurl}{\textcolor{white}{\theurldesc}}}
\end{flushright}
\end{textblock}
% 
${}$
\end{titlepage}
\restoregeometry % restores the geometry
\nopagecolor% Use this to restore the color pages to white
\color{black}
\pagenumbering{arabic}

% Title Page

\newpage
\thispagestyle{empty}
\begingroup
\centering
\vspace*{\baselineskip}
{\Large \authors}\\[0.07\textheight]
\begin{tikzpicture}[scale=1.5,rotate=135]
 \draw [white,fill=maincolor] (0,0) -- (0,1) -- (1,1) -- (1,0) -- (0,0);
 \draw [white,fill=white] (0.25,0) -- (0.25,0.8) -- (0.55,0.8) -- (0.55,1) -- (0.75,1) -- (0.75,0.6) -- (0.45,0.6) -- (0.45,0) -- (0.25,0);
\end{tikzpicture}
\\[0.06\textheight]
{\LARGE\bfseries\sffamily \textcolor{maincolor}{ДАСГАЛ БОДЛОГЫН ХУРААМЖ}}\\[0.5\baselineskip]
\makebox[0pt][c]{\textcolor{maincolor!50}{\rule{0.75\textwidth}{1pt}}}\\[2\baselineskip]
{\Large \thesubtitle}\\[1.5\baselineskip]
{\large Анхны хэвлэл}
\par\vfill
{\large Улаанбаатар\ \printed}\par
\vspace*{3\baselineskip}
\endgroup
\clearpage

% Copyright Page

\newpage
\thispagestyle{empty}
\begingroup
\noindent
\bookInfoDAA \\
\bookInfoNNA \\
\bookInfoM
\vfill
\noindent
Дасгал бодлогын хураамж
\\[0.3\baselineskip]
\thesubtitle
\\[\baselineskip]
Анхны хэвлэл
\\[\baselineskip]
Зохиогч \authors \\[0.3\baselineskip]
Редактор\ \editor \\[0.3\baselineskip]
Эх бэлдсэн Г.Махгал \\[\baselineskip]
Харилцах хаяг \href{https://www.galaa.net/}{www.galaa.net}\\[\baselineskip]
\copyright\;\copyrightyears\ \authors. Бүх эрх хамгаалагдсан. \\[0.3\baselineskip]
Зохиогчийн зөвшөөрөлгүйгээр бодлогын хураамжийг хэсэгчлэн болон бүтнээр нь цаасан болон дижитал, бусад аливаа хэлбэрээр хуулбарлах, хувилан олшруулахыг хориглоно. \\[\baselineskip]
\publisher\ хэвлэх үйлдвэрт хэвлэв. \\[0.3\baselineskip]
Хэвлэлийн хуудас \pp. Цаасны хэмжээ B5. Эхийг \LaTeX\ програмаар бэлтгэв. \\[0.3\baselineskip]
\ISBN
\endgroup
\clearpage

% Preface

\begin{center}
\color{maincolor}
\textbf{\LARGE Өмнөх үг}
\rule{1\linewidth}{1pt}
\end{center}
\thispagestyle{empty}
{
\setlength{\parindent}{1cm}
\setlength{\parskip}{1ex plus 0.5ex minus 0.2ex}
\foreword
}

{
\pagestyle{empty}
\cleardoublepage
}

\tableofcontents

{
\pagestyle{empty}
\cleardoublepage
}

\section{Section name}

\begin{questions}

\fullwidth{\subsection*{Subsection name}}

\item[]

\begin{example}
\lipsum[1-3]
\end{example}

\fullwidth{\subsection*{Subsection name}}

\lipsum[1]

\question
\lipsum[1]
\begin{tasks}
 \task \lipsum[2]
 \task \lipsum[3]
\end{tasks}

\begin{answer}
\begin{tasks}
 \task \lipsum[2]
 \task \lipsum[3]
\end{tasks}
\end{answer}

\question
\lipsum[4]

\begin{answer}
\lipsum[5]
\end{answer}

\end{questions}

\section{Section name}

\begin{questions}

\fullwidth{\subsection*{Subsection name}}

\item[]\vspace{-\baselineskip}

\begin{example}
\lipsum[1]
\end{example}

\question
\lipsum[1]
\begin{tasks}
\task \lipsum[2]
\task \lipsum[3]
\end{tasks}

\begin{answer}
\begin{tasks}
\task \lipsum[4]
\task \lipsum[5]
\end{tasks}
\end{answer}

\end{questions}

\cleardoublepage

\showallanswers

\cleardoublepage

\backCover

\end{document}