xsim: problems with multiple questions

Question

With xsim, how to type a problem with several parts (questions) in such a way that a number of points is assigned to each part and the total number of points for the whole problem is calculated automatically. The package eqexam offers that feature conveniently.

Answer 1

\documentclass{article}
\usepackage[verbose]{xsim}
\usepackage{bophook}
\newcounter{pagepoints}


\DeclareExerciseEnvironmentTemplate{simple}
  {\par\noindent\setcounter{pagepoints}{\numexpr\GetExerciseProperty{points}+\value{pagepoints}}{\large\bfseries\theexercise\ }
  }
{[points=\GetExerciseProperty{points}]\par}

\xsimsetup{
exercise/within=section ,
exercise/the-counter = \thesection.\arabic{exercise}
,
exercise/template=simple ,
exercise/name=Example ,
solution/template=red}

\AtBeginPage{\setcounter{pagepoints}{0}}
\begin{document}
\section{Test}
\begin{exercise}[points=2]
Lorem ipsum
\end{exercise}
\begin{exercise}[points=8]
  second Lorem
\end{exercise}
  \vfill\hfill
[total=\thepagepoints]
\pagebreak
\begin{exercise}[points=13]
Lorem ipsum
\end{exercise}
\begin{exercise}[points=7]
  second Lorem
\end{exercise} 
\vfill\hfill
[total=\thepagepoints]
\end{document}

Output: