Math problem set template

\documentclass[10pt]{article}
\usepackage{geometry} 
\geometry{margin=1in}
\renewcommand\thesection{\arabic{section}}
\renewcommand\thesubsection{\thesection.\arabic{subsection}}
\usepackage{graphicx}
\usepackage{array}
\usepackage{pifont}
\usepackage{amsmath}
\usepackage{amsfonts}  
\usepackage{amssymb}
\usepackage{epstopdf}
\usepackage{enumitem}
\usepackage[sort&compress, numbers] {natbib}
\usepackage{mathtools}
\usepackage{bbm}
\usepackage{url}
\usepackage{wrapfig}
\usepackage{appendix}
\usepackage{cases}
\usepackage{enumitem}

\newcommand{\problem}[1]{\section*{#1.}}
\newcommand{\subproblem}[1]{\noindent\emph{#1.}}

\newcommand{\N}{\mathcal{N}}
\newcommand{\A}{\mathcal{A}}
\newcommand{\X}{\mathcal{X}}
\newcommand{\PP}{\mathcal{P}}
\newcommand{\nat}{\mathbb{N}}
\newcommand{\bit}{\begin{itemize}}
\newcommand{\eit}{\end{itemize}}
\newcommand{\1}{\mathbbm{1}}
\newcommand{\E}{\mathbb{E}}
\newcommand{\Z}{\mathbb{Z}}
\newcommand{\R}{\mathbb{R}}
\newcommand{\B}{\mathbb{B}}
\newcommand{\BB}{\mathcal{B}}
\newcommand{\SSS}{\mathcal{S}}
\newcommand{\T}{\mathcal{T}}
\newcommand{\CC}{\mathcal{C}}
\newcommand{\C}{\mathbb{C}}
\newcommand{\D}{\mathcal{D}}
\newcommand{\inprob}{\overset{P}{\longrightarrow}}
\newcommand{\indist}{\overset{D}{\longrightarrow}}
\newcommand{\Log}{\text{log}}
\newcommand{\Exp}{\text{exp}}
\newcommand{\inprod}[2]{\langle #1, #2 \rangle}
\newcommand{\bigominus}{\mathop{\raisebox{-.1em}{\Large\boldmath$\ominus$}}}
\newcommand{\defeq}{\buildrel\triangle\over =}
\usepackage{cancel}
\usepackage{multirow}
\usepackage[bottom]{footmisc}
\setlength{\parindent}{1cm} 
\newenvironment{myindentpar}[1]%
 {\begin{list}{}%
         {\setlength{\leftmargin}{#1}}%
         \item[]%
 }
 {\end{list}} 
 \newcommand{\itemEq}[1]{%
        \begingroup%
        \setlength{\abovedisplayskip}{0pt}%
        \setlength{\belowdisplayskip}{0pt}%
        \parbox[c]{\linewidth}{\begin{flalign}#1&&\end{flalign}}%
        \endgroup}
\newcolumntype{C}{@{}>{\ding{232}}r@{}}

 \begin{document}
\title{} 
\author{}
\date{}
\maketitle

\end{document}