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\documentclass{article}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage[a4paper, margin=2.5cm, noheadfoot]{geometry}
\usepackage{amsmath}
\usepackage[seed=1]{randomlist}
\pagestyle{empty}
\setlength{\parindent}{0pt}
\NewList{Pupils}
\NewList{Triples}
\begin{document}
\ReadFileList{Pupils}{pupils.dat}
\ExtractFirstItem{Pupils}{NULL} % extract title line
\ReadFileList{Triples}{pythagoras.dat}
\ForEachFirstItem{Pupils}{Pupil}
{%
\ReadFieldItem{\Pupil}{0}{Name}
\ReadFieldItem{\Pupil}{1}{FName}
\ReadFieldItem{\Pupil}{2}{Note}
\ExtractRandomItem{Triples}{Triple}
\ReadFieldItem{\Triple}{0}{Triplea}
\ReadFieldItem{\Triple}{1}{Tripleb}
\ReadFieldItem{\Triple}{2}{Triplec}
\begin{center}
\fbox{\huge\bfseries Test for \Name{} \FName}
\end{center}
\textbf{Exercise} \par
\if A\Note
The diagonal of a rectangle is \Triplec~in and a side of this
rectangle is \Triplea~in. What is the length of the other side of
the rectangle?
\else
Find the length of the diagonal of a rectangle that is \Triplea~in
by \Tripleb~in.
\fi
\newpage
\begin{center}
\fbox{\huge\bfseries Answer to the test for \Name{} \FName}
\end{center}
\textbf{Exercise} \par
\if A\Note
Use Pythagorean theorem. We have:
\[\text{diag}^2=\text{side1}^2+\text{side2}^2.\]
Here:
\[\Triplec^2=\Triplea^2+\text{side2}^2\]
and then
\[\text{side2}=\sqrt{\Triplec^2-\Triplea^2} = \Tripleb.\]
\else
Use Pythagorean theorem. We have:
\[\text{diag}^2=\text{side1}^2+\text{side2}^2.\]
Here:
\[\text{diag}^2=\Triplea^2+\Tripleb^2\]
and then
\[\text{diag}=\sqrt{\Triplea^2+\Tripleb^2} = \Triplec.\]
\fi
\newpage
}
\end{document}
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