Grade table too long within exam document class

Question

I'm creating my own exam paper and I have 15 different questions. Using the code

\gradetable[h][questions]

I'm getting a grade table. However as I have so many questions the table it too big

I'm trying to split the table in half and put them under each other but I cant get any code to work.

When I have been using the command

\begin{center}

\setlength{\doublerulesep}{0.25in}

\multirowgradetable{2}[questions]

\end{center}

It just keeps on coming up with a error

Answer 1

As mentionned in the exam class manual:

If you want to print a horizontal grading table but the table would be too large for the page, you can print a grading table with multiple rows by giving the command: \multirowgradetable{numrows}[questions or pages]

The MWE

\documentclass[addpoints,answers]{exam}
\usepackage{pgffor}

\begin{document}
\begin{questions}

\foreach \i in {1,...,10}
{
\question[\i]

a nice question

\begin{solution}
my solution
\end{solution}
}



\end{questions}

\multirowgradetable{2}



\end{document}

Answer 2

In addition to answer of Hafid Boukhoulda (using his code), you can adjust the cell width of gradetable with \cellwidth command (exam class manual, p.89).

\documentclass[addpoints]{exam}
\usepackage[showframe]{geometry} % For testing the gradetable is in frame?
\usepackage{pgffor}

\begin{document}
\begin{questions}

\foreach \i in {1,...,15}
{
\question[\i]
a nice question
}
\end{questions}

\cellwidth{0.3cm}

\gradetable[h][questions]
\end{document}