Stefan "stefan"@mus. INVALID .ch wrote
This makes me think: Why not have him read those two books? Just an idea...

Of course I did. In the US, it is almost unthinkable to send a
student to a glider checkride who had not seen these books. The fact
remains that the Soaring Flight Manual mostly contains information
that is already familiar to him. When one must read a book containing
mostly familiar information, it is only human to move quickly - and
maybe miss something.

Michael