Is there a way to empty the blocks after each recurse cycle.
If i make three exams with the command \dorecurse[3], in the first exam i
found the hints and the answers of all exams.

I try with the commands \resetnumber[hint, answer], but don't work.

%%%% begin question-hint-answer-blocks.tex
\defineblock[question]
\defineblock[hint]
\defineblock[answer]

\defineenumeration[question]
        [alternative=hanging,
        width=2.5cm,
        text={Question},
        headstyle={\bi},
        stopper={.}]

\defineenumeration[hint]
        [alternative=hanging,
        width=4cm,
        text={Hint for question},
        headstyle={\bi},
        stopper={.}]

\defineenumeration[answer]
        [alternative=hanging,        width=4.5cm,
        text={Answer to question},
        headstyle={\bi},
        stopper={.}]

\setupblock[question][before={\startquestion},after={\stopquestion}]
\setupblock[hint][before={\starthint},after={\stophint}]
\setupblock[answer][before={\startanswer},after={\stopanswer}]
\keepblocks[question]
\hideblocks[hint]
\hideblocks[answer]




\startsetups examn:make

\resetnumber[answer]
\resetnumber[question]
\resetnumber[hint]
    \page
        \setcounter[userpage][1]
\centerline{\kap{Maths}}
 \centerline{\kap{Worksheet}}  \crlf
 Name:\thinrules[n=1]%, interlinespace=big]
Evaluation:\thinrules[n=1]%, interlinespace=big]


    \getbuffer[examn]

\stopsetups

\starttext
\setuppagenumbering[state=stop]
\startbuffer[examn]

\section{Questions}

\beginquestion
  Compute $4\times 5$.



\endquestion

\beginhint
  Use the fact that $2\times 5 = 10$.
\endhint

\beginanswer
  $20$.
\endanswer

\beginquestion
  What is the value of $100 / 10$?
\endquestion

\beginhint
Remember that $10\times 10 = 100$.
\endhint

\beginanswer
$10$
\endanswer

\section{Hints to all questions}

\useblocks[hint]

\section{Answers to all questions}

\useblocks[answer]

\setuppagenumber[number=1]
\stopbuffer

\setuprandomize[124] % set a seed


\dorecurse{3} {\setups[examn:make]}

\stoptext

Thanks a lot

Jorge