This time the whole letter has loaded (the top few paras were cut off the first time I looked at it), and I now see there's a reference to "equip yourself for your Air Force career by studying subjects which will help you". Presumably the 'arrangements' would be some sort of guidance on which subjects to concentrate on, and where the prospective airman would find a relevent course.
Thank you Danny, you're now the third British serviceman with no recollection of any Air Force-provided pre-training study, strongly suggesting that such a thing didn't in fact exist.
And that training manual nails it. 21 lessons, RAAF issued, and in tiny print at the bottom, something about returning it when 'the reservist is called up'. I reckon we've found our beast.
Well done, all!
Adam