If you are interested in this topic try checking Russian-speaking resources.
For example, here's a book "Подготовка разведчика: система спецназа ГРУ" (you can read it online)
I doubt you'll read any top classified info there, but it gives you some idea of the process, with real life examples. I find qualifying/fitness standards for soldiers on various tasks particularly interesting.

You might also be interested in "Спецназ" magazine. I've seen online Russian versions from the late 90's published in Moscow: "Everything about everyday life, history and training of special units (милиция, КГБ, МЧС, ГРУ)", and more up to date Belorussian magazines (in Russian). Just one issue for starters: June 2010 (depositfiles link is valid, I've just checked it)

There are also various CDs available, such as "Энциклопедия "Спецназ России". Подготовка бойца Спецназа" collection, though it hardly bears much resemblance to real life, even if the tutors and consultants are specnaz officers, as advertised. Still, you can buy them or download them illegally, if you wish.