\documentclass[11pt,letterpaper]{article}
\usepackage[lmargin=1in,rmargin=1in,tmargin=1in,bmargin=1in]{geometry}
\usepackage{worksheet}
% -------------------
% Content
% -------------------
\begin{document}
\worksheet{Topic 1}{DD/MM}
% Question
\prob This is an unnumbered problem. \pspace
% Question 1
\problem This is a numbered problem. \vspace{1.5cm}
% Question 2
\problem This is the second numbered problem. \vfill
% Question 3
\problem This problem has several parts:
\begin{enumerate}[(a)]
\item The first part.
\item The second part.
\item The third part.
\end{enumerate} \vspace{6cm}
\end{document}