PassOptionsToPackage Order / priority (solving a package class)

Question

I use the teach package (which isn't on ctan but can be downloaded here).

My document was first :

\documentclass[a4paper]{report}
\usepackage[utf8]{inputenc}
\usepackage[french]{babel}
\usepackage[T1]{fontenc}

\usepackage{geometry}
\geometry{hmargin=1cm,vmargin=1cm}
\usepackage[]{teach} 

\begin{document}

dsgsgsd

\end{document}

But it ended with the following error :

LaTeX Error: Option clash for package geometry.

Which was triggered by the teach package using geometry package with parameter :

% THIS CODE IS IN TEACH PACKAGE SOURCE
\RequirePackage[%
            hmargin=2.5cm,
            vmargin=2cm
            %,showframe,showcrop
            ]{geometry}

I found a solution with the \PassOptionsToPackage command :

\PassOptionsToPackage{hmargin=1cm,vmargin=1cm}{geometry}
\documentclass[a4paper]{report}
\usepackage[utf8]{inputenc}
\usepackage[french]{babel}
\usepackage[T1]{fontenc}

\usepackage[]{teach} 

\begin{document}

dsgsgsd

\end{document}

I no longer have the error but the margin are wrong (it use the margins defined by teach instead of mine).

I suggest it's because PassOptionsToPackage have lower priority than the ones called by the teach package.

How can I solve my issue ?

Answer 1

Moving

\geometry{hmargin=1cm,vmargin=1cm}

after

\usepackage[]{teach} 

and deleting

\usepackage{geometry}

Works so my problem is fixed.

But if someone know a general solution about this (i.e. make \PassOptionsToPackage have priority) please answer this might be usefull in the future to me or someone else.

Complete code:

\documentclass[a4paper]{report}
\usepackage[utf8]{inputenc}
\usepackage[french]{babel}
\usepackage[T1]{fontenc}

\usepackage[]{teach} 
\geometry{hmargin=1cm,vmargin=1cm}


\begin{document}

dsgsgsd

\end{document}