Add an extra row to grade table in exam class

Question

Consider the following MWE.

\documentclass[addpoints]{exam}

\begin{document}

\begin{questions}
  \question [10] First question text.
  \question [20] Second question text.
\end{questions}

\gradetable[h]

\end{document}

I would like to add another row (say for signature of graders to individual questions) to the grade table that is generated.

How do I do that?

Answer 1

You can accomplish that by grossly abusing the \combinedgradetable command, as in:

\documentclass[addpoints]{exam}

\begin{document}

\begin{questions}
  \question [10] First question text.
  \question [20] Second question text.
\end{questions}

\begingroup
  \chbpword{Signature:}
  \settabletotalbonuspoints{}
  \renewcommand{\bonuspointsofquestion}[1]{}
  \combinedgradetable[h]
\endgroup

\end{document}

The \chbpword command replaces the text Bonus points: with Signature, the \settabletotalbonuspoints command causes the box for the total bonus points to be left empty, and the renewcommand causes the boxes for the bonus points of each question to be left empty.

Answer 2

This code:

\begingroup
  \chbpword{Score:}
  \chsword{Signature:}
  \settabletotalbonuspoints{}
  \renewcommand{\bonuspointsofquestion}[1]{}
  \combinedgradetable[h]
\endgroup

reverses the Score and Signature names so that Signature is on the bottom row.