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\documentclass{article}
\usepackage{xsim}
\DeclareExerciseGoal{A}
\DeclareExerciseGoal{C}
\DeclareExerciseGoal{E}
\newcommand*\printA{\TotalExerciseGoal{A}{~A~point}{~A~points}}
\newcommand*\printC{\TotalExerciseGoal{C}{~C~point}{~C~points}}
\newcommand*\printE{\TotalExerciseGoal{E}{~E~point}{~E~points}}
\usepackage{needspace}
\DeclareExerciseEnvironmentTemplate{custom}
{%
\par\vspace{\baselineskip}
\Needspace*{2\baselineskip}
\noindent
\textbf{\GetExerciseProperty{counter}}%
\IfExercisePropertySetT{subtitle}
{ \textit{\GetExerciseProperty{subtitle}}} %
\IfInsideSolutionF{%
\marginpar{%
(\IfExercisePropertySetTF{E}{\GetExerciseProperty{E}}{0}/%
\IfExercisePropertySetTF{C}{\GetExerciseProperty{C}}{0}/%
\IfExercisePropertySetTF{A}{\GetExerciseProperty{A}}{0})%
}%
}%
}
{}
\xsimsetup{
exercise/template = custom ,
solution/template = custom
}
\renewcommand*\theexercise{\arabic{exercise}.}
\begin{document}
Reachable: \printA, \printC, and \printE.
\begin{exercise}[E=1]
Differentiate $y=3x^2+5x+3$.
\end{exercise}
\begin{exercise}[E=2,C=1]
Find the equation of the tangent line to the function $y=x/2$ at $x=2$.
\end{exercise}
\begin{exercise}[C=1,A=2]
Prove that the derivative of a constant is zero.
\end{exercise}
\end{document}
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