With AMC 1.3.0 or higher.
The documentation

Groups of questions can be manipulated more precisely thanks to the following commands:

    \insertgroup[n]{mygroup} (using optional parameter n) only inserts the n first elements from the group.

    \insertgroupfrom[n]{groupname}{i} The command does the same as \insertgroup[n]{groupname}, starting from element at index i (the first element has index 0).

    \cleargroup{mygroup} clears all group content.

    \copygroup{groupA}{groupB} copies all the elements from group groupA to the end of group groupB. With an optional argument n, only the n first elements will be copied: \copygroup[n]{groupA}{groupB}

many thanks for your prompt reply.
just one more question. How can I squeeze as much as possible tick answers in a line?
I am using multicols but it can go up to 6.
I have no text per answer just the tick boxes,that the student must select.

thank you again,
KYR. GI.

just to add to the above, without shuffling the answers, so that the answers are in the same order as in the source.tex

just to add to the above, without shuffling the answers, so that the answers are in the same order as in the source.tex

Add the option : [o]

    \begin{choices}[o]
        \correctchoice{}
        \wrongchoice{}
        \wrongchoice{}
        \wrongchoice{}
        \wrongchoice{}
        \wrongchoice{}
    \end{choices}

I am using multicols but it can go up to 6.

I don't understand why ? What is the paper size ?
I think this code could work,choose your unit.

\begin{multicols}{6}
    \begin{choices}[o]
        \correctchoice{}\hspace*{-3cm}
        \wrongchoice{}\hspace*{-3em}
        \wrongchoice{}\hspace*{-3pt}}
        \wrongchoice{}\hspace*{-3mm}
        \wrongchoice{}\hspace*{-3ex}
        \wrongchoice{}
    \end{choices}
\end{multicols}

thank you for your prompt reply.

the [0] worked fine.
I am using two columns for the whole test and 6-10 columns for the choices of each question.

What I am trying to do is to match a 2x 8 byte word (ie
ff ae ab s3 4a ae ae ae \newline
ae ae ae ae ae ae ae ae \newline

to the answer choices. (student must find certain hex numbers).

I tried to use a table inside the choices, but with partial success. ie
\begin{tabular}{p{5mm} p{5mm} p{5mm} p{5mm} p{5mm} p{5mm} p{5mm} p{5mm}}

\wrongchoice{} &\wrongchoice{} &\wrongchoice{} &\wrongchoice{} &\wrongchoice{}&\wrongchoice{}&\correctchoice{} &\correctchoice{} \\

the catalog is print ok, but the student subject has no boxes at all. it is just empty.

it seems I managed to do what I had in mind.
I used the \AMCBoxOnly{ordered=true} command as follows.

\AMCBoxOnly{ordered=true}{
\wrongchoice[A]{}\correctchoice[A]{}\wrongchoice[C]{}\wrongchoice[D]{}\wrongchoice[A]{}\correctchoice[A]{}\wrongchoice[C]{}\wrongchoice[D]{}
\newline

The answers are printed in order and in one line.

It can be useful to other people trying the same.

KYR.