Btukfyl

I want to prepare a book with many chapters (and sections), notes, exercises and linked solutions at the end of the book . I decided to adopt the example from on matching enumerated exercises with their answer. However, I want to display points per question part as shown here . The exam package

documentclass{memoir}



 usepackage{amsmath}

 usepackage[inline]{enumitem}

 usepackage{xcolor}

 usepackage{ntheorem}

 theorembodyfont{upshape}

 theoremseparator{.}



 usepackage{answers}

 Newassociation{sol}{Solution}{ans}

 renewcommand{Solutionlabel}[1]{small{#1.}}

 newtheorem{ex}{}[section]

 renewcommand{theex}{arabic{ex}}

 newenvironment{Ex}[1]{begin{trivlist}item textsc{#1} %

 renewcommand{Currentlabel}{#1}}{end{trivlist}}



usepackage{multicol}

 newenvironment{mtmulticols}[1]{%

 Writetofile{ans}{stringbegin{multicols}{#1}}

 begin{multicols}{#1}}{end{multicols}%

 Writetofile{ans}{stringend{multicols}}}



Newassociation{solitem}{Solutionsubitem}{ans}

  renewcommand{Solutionsubitemlabel}[1]{#1}

  newenvironment{Solutionsublist}{Writetofile{ans}{stringbegin{Solution}  {theex}}}{Writetofile{ans}{stringend{Solution}}}`



begin{document}

 chapter{Polynomials}

 section{Partial fractions}

 label{sec:partial-fractions}

 tracingmacros=1

 Opensolutionfile{ans}[partial-fractions]

 section*{Exercises for Section ref{sec:partial-fractions}}

 vspace{-0.6cm}

 hrulefill

 begin{Ex}{Warm-ups}

 end{Ex}

 begin{ex}

 Who is the most famous mathematician of all time?

 begin{sol}

 Euler

 end{sol}

 end{ex}

 begin{ex}

 Resolve each of the following proper rational expressions (some filler here)  into partial fractions.

 begin{multicols}{3}

 begin{Solutionsublist}

 begin{enumerate}[label=(alph*)]

 item $displaystyle{frac{1}{(x - 1)(x - 2)}}$

  begin{solitem}

    $displaystyle{frac{1}{x - 2} - frac{1}{x - 1}}$

  end{solitem}

 item $displaystyle{frac{5x + 4}{x^2 + x - 2}}$

  begin{solitem}

    $displaystyle{frac{2}{x + 2} + frac{3}{x - 1}}$

  end{solitem}

 item $displaystyle{frac{7x - 1}{2x^2 - x - 1}}$

  begin{solitem}

    $displaystyle{frac{3}{2x + 1} + frac{2}{x - 1}}$

  end{solitem}

 item $displaystyle{frac{25}{18x^3 - 9x^2 - 11x + 2}}$

  begin{solitem}

    $displaystyle{frac{3}{3x + 2} - frac{12}{6x - 1} + frac{1}{x -

      1}}$

  end{solitem}

 item $displaystyle{frac{x^2 + 15x - 4}{(x + 1)(x + 2)(x - 8)}}$

  begin{solitem}

    $displaystyle{frac{2}{x - 8} + frac{2}{x + 1} - frac{3}{x +

      2}}$

  end{solitem}

 item $displaystyle{frac{48}{(x^2 - 1)(x^2 - 9)}}$

  begin{solitem}

    $displaystyle{frac{3}{x - 1} + frac{3}{x + 1} - frac{1}{x + 3}

    + frac{1}{x - 3}}$

  end{solitem}

 end{enumerate}

 end{Solutionsublist}

 end{multicols}

 end{ex}



Closesolutionfile{ans}

  section*{Answers for Section ref{sec:partial-fractions}}

 input{partial-fractions}



 end{document}