\documentclass{article}
\usepackage{xsim}

\xsimsetup{grades/split=;}

\DeclareGradeDistribution{
  1   = 1 ;
  1,5 = .9167 ;
  2   = .8333 ;
  2,5 = .75 ;
  3   = .6667 ;
  3,5 = .5833 ;
  4   = .5
}

\begin{document}

\begin{exercise}[points=4]
\end{exercise}

\begin{exercise}[points=4]
\end{exercise}

\begin{exercise}[points=4]
\end{exercise}

\begin{exercise}[points=4,bonus-points=10]
\end{exercise}

\begin{exercise}[points=4]
\end{exercise}

\begin{exercise}[points=4]
\end{exercise}


\goalsforgrade{points + bonus-points}{1,5}
\goalsforgrade{points+bonus-points}{2}

\pointsforgrade{1}
\pointsforgrade{1,5}
\pointsforgrade{2}
\pointsforgrade{2,5}
\pointsforgrade{3}
\pointsforgrade{3,5}
\pointsforgrade{4}

\totalgoalforgrade{1}
\totalgoalforgrade{1,5}
\totalgoalforgrade{2}
\totalgoalforgrade{2,5}
\totalgoalforgrade{3}
\totalgoalforgrade{3,5}
\totalgoalforgrade{4}

\end{document}