demo.tex

\documentclass{exercisesheet}
\newcommand{\BlattNr}{1}
\title{Vorlesung, Übung \BlattNr}
\author{
    Max Mustermann \\ 123456
    \and
    Erika Musterfrau \\ 123457
    \and 
    Spock \\ 694200
}

\renewcommand{\Exercise}{Aufgabe}

\begin{document}
\maketitle
\pointtable

\begin{exercise}{10.5}
	\begin{subexercise}
		Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, 
		sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem 
		ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore 
		magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet.
	\end{subexercise}

	\begin{subexercise}
		Duis autem vel eum iriure dolor in hendrerit in vulputate velit esse molestie consequat, vel illum dolore eu feugiat nulla facilisis 
		at vero eros et accumsan et iusto odio dignissim qui blandit praesent luptatum zzril delenit augue duis dolore te feugait nulla facilisi. 
		Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat.   
	\end{subexercise}

	\begin{subexercise}
		Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, 
		consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. 
		At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet.
	\end{subexercise}
\end{exercise}


\begin{exercise}{12}
	\begin{subexercise}
		Duis autem vel eum iriure dolor in hendrerit in vulputate velit esse molestie consequat, vel illum dolore eu feugiat nulla facilisis.
		$$ \nabla \psi(\bar y) = \sum_{k \in [1,n]} \frac{\partial\psi(\bar y)}{\partial x_k}e_k$$
		Ut wisi enim ad minim veniam, quis nostrud exerci tation ullamcorper suscipit lobortis nisl ut aliquip ex ea commodo consequat. 
		Duis autem vel eum iriure dolor in hendrerit in vulputate velit esse molestie consequat, vel illum dolore eu feugiat nulla facilisis at 
		vero eros et accumsan et iusto odio dignissim qui blandit praesent luptatum zzril delenit augue duis dolore te feugait nulla facilisi.
	\end{subexercise}
\end{exercise}


\begin{exercise}{10}
	Consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. 
	At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. 
	Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. 
	At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. 
	
\end{exercise}

\begin{exercise}{20}
	Consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. 
	At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. 
	Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. 
	At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. 
	
\end{exercise}

\end{document}

exercisesheet.cls

\NeedsTeXFormat{LaTeX2e}

\LoadClass{article}
\ProvidesClass{exercisesheet}

\setlength{\parindent}{0pt}

\RequirePackage{geometry}
\geometry{
	a4paper,
	left = 2cm,
	right = 2cm,
	top = 2cm,
	bottom = 3cm
}


\RequirePackage[utf8]{inputenc}
\RequirePackage[T1]{fontenc}
\RequirePackage{lmodern}
\RequirePackage{amsmath, amsfonts, amssymb, amsthm}
\RequirePackage{multicol}
\RequirePackage{listings}
\RequirePackage{xcolor}
\RequirePackage{tikz}
\usetikzlibrary{shapes, arrows, positioning, patterns, decorations.pathreplacing}

\RequirePackage{totcount}
\RequirePackage{changepage}
\RequirePackage{etoolbox}
\RequirePackage{environ}

\RequirePackage{booktabs}
\RequirePackage{mathtools} 
\RequirePackage{xstring} 
\RequirePackage{enumerate}
\RequirePackage{hhline}
\RequirePackage{wasysym}
\RequirePackage{latexsym}

\RequirePackage{minted}
\setminted{breaklines}

\newcommand{\longequal}[1]{\mathop{\overset{\mathrm{#1}}{\resizebox{\widthof{\ensuremath{\mathop{\overset{\mathrm{#1}}{=}}}}}{\heightof{=}}{=}}}}
\newcommand{\n}{~\\}
\newcommand{\seperator}{~|~}
\newcommand{\sgn}{\text{sgn}}
\newcommand{\norm}[1]{\left\lVert#1\right\rVert}
\newcommand{\abs}[1]{\left|#1\right|}

% Aufgaben-Commands
% \aufgabe{Punktzahl}
\newtotcounter{exercisenumber}
\newtotcounter{subexercisenumber}
\newtotcounter{totalpoints}

\newcommand{\Exercise}{Exercise}

\newenvironment{exercise}[1]
{
	\def\points{#1}
	\stepcounter{exercisenumber}
	\setcounter{subexercisenumber}{0}
	\section*{\Exercise~\arabic{exercisenumber}}
}
{	
	\phantom{} \hfill A\arabic{exercisenumber}: \framebox[1.75cm]{\hspace{1cm}/\hfill\points\hspace{5pt}} \\
	\addtocounter{totalpoints}{100*\real{\points}}
	\addPT{\arabic{exercisenumber}}{\points}
}

\newenvironment{subexercise}[1][0]
{
	\stepcounter{subexercisenumber}
	
	\ifnum\value{subexercisenumber}=1
	\else
		\vspace{1em}
	\fi
	
	\textbf{(\alph{subexercisenumber})}
	\begin{adjustwidth}{2em}{0em}
	\vspace{-\baselineskip}
}
{
	\end{adjustwidth}
}

\newcommand{\addPT}[2]
{
	    \edef\tempA{A#1 &}
	    \edef\tempB{\qquad/#2 &}
	
	\expandafter\gappto\expandafter\PTableA\expandafter{\tempA}
	\expandafter\gappto\expandafter\PTableB\expandafter{\tempB}
	\expandafter\gappto\expandafter\PTHead\expandafter{c | }
}

\newcommand{\pointtable}{
    \begin{table}[h!]
        \centering
        \ifcsname PTableASaved\endcsname
        \begin{tabular}{\PTHeadSaved c}
            \PTableASaved $\Sigma$ \\ \hline
        	\PTableBSaved \qquad / \StrGobbleRight{\totalpointsSaved}{2}.\StrRight{\totalpointsSaved}{2}
        	%\PTableBSaved \qquad / \totalpointsSaved
    	\end{tabular}
        \else
        Compile again\ClassWarning{Compile again}
        \fi
    \end{table}
}
\AtEndDocument{
    \makeatletter
    \immediate\write\@mainaux{\string\gdef\string\PTableASaved{\PTableA}}%
    \immediate\write\@mainaux{\string\gdef\string\PTableBSaved{\PTableB}}%
    \immediate\write\@mainaux{\string\gdef\string\PTHeadSaved{\PTHead}}%
    \setcounter{totalpoints}{\totvalue{totalpoints}}
    \immediate\write\@mainaux{\string\gdef\string\totalpointsSaved{\arabic{totalpoints}}}%
    \makeatother
}