Create a "Choose between" in exam class, follow up question

Question

This question was considered in an attempt to achieve what I want: Create a "choose between " questions with exam class

Background: I'm a math teacher with (very) mixed ability classes. I would like to be able to add "choose between A or B" (or C) questions to my tests, where A gives less credit than B.

Consider the MWE

• I would like to have only the third question to add to the sum of points.
• It would be nice if the grading table would include all three parts with their points, such that I can fill in the score the student achieved at the question he/she chose.

This MWE is very minimalistic, I honestly have no idea how I'm going to achieve this.

\documentclass{exam}

\begin{document}
    \begin{questions}
        \question Choose one of the three following questions
        \begin{parts} % only the third part should add to the total sum of points
            \part[1] Option 1
            \part[2] Option 2
            \part[3] Option 3
        \end{parts}
    \end{questions}
\end{document}

Answer 1

From my understanding of the exam class, you can't do exactly what you want with question parts, because the grading table lists questions and not their component parts. However if you restructure things a bit, I think you can achieve your end (assuming I understand you correctly). Instead of treating these as parts of one question, make them three separate questions and give the instructions to pick one with \uplevel{}. In the grading table, you can set the total point count to whatever value you want with \settabletotalpoints{}. Does the following do what you want?

Edit: added definitions to calculate the final total automatically

\documentclass[addpoints,answers]{exam}

\newcounter{mytotal}
\newcommand{\questionintotal}[2]{\addtocounter{mytotal}{#1}\question[#1] #2}
\newcommand{\questionnototal}[2]{\question[#1] #2}

\newcommand{\mygradetable}{
 \settabletotalpoints{\themytotal}
  \gradetable[v][questions]
}

\begin{document}

\begin{questions}
    \uplevel{Choose one of the three following questions}
    \questionnototal{1}{Option 1}
    \questionnototal{2}{Option 2}
    \questionintotal{3}{Option 3}
\end{questions}

\mygradetable

\end{document}