\documentclass[12pt]{exam}
\usepackage{amsthm}
\usepackage{libertine}
\usepackage[utf8]{inputenc}
\usepackage[margin=1in]{geometry}
\usepackage{amsmath,amssymb}
\usepackage{multicol}
\usepackage[shortlabels]{enumitem}
\usepackage{siunitx}
\usepackage{cancel}
\usepackage{graphicx}
\usepackage{pgfplots}
\usepackage{listings}
\usepackage{tikz}
\pgfplotsset{width=10cm,compat=1.9}
\usepgfplotslibrary{external}
\tikzexternalize
\newcommand{\class}{Course Name Here} % This is the name of the course
\newcommand{\examnum}{Assignment Name Here} % This is the name of the assignment
\newcommand{\examdate}{Date Here} % This is the due date
\newcommand{\timelimit}{}
\begin{document}
\pagestyle{plain}
\thispagestyle{empty}
\noindent
\begin{tabular*}{\textwidth}{l @{\extracolsep{\fill}} r @{\extracolsep{6pt}} l}
\textbf{\class} & \textbf{Name:} & \textit{Your Name Here}\\ %Your name here instead, obviously
\textbf{\examnum} &&\\
\textbf{\examdate} &&\\
\end{tabular*}\\
\rule[2ex]{\textwidth}{2pt}
% ---
\begin{enumerate} %You can make lists!
\item This is the first item.
\item This will make another item. % You can do this for each question.
\item Yet another item.
\item Lists within lists! \begin{enumerate}
\item ha-HA!
\item see?
\end{enumerate}
\end{enumerate}
Look! Math! $f(x)=4x^2 - \frac{3}{4}x +1$ %use the dollar signs to go into math mode
\end{document}
