"I was eleven years old when my father decided that the tutoring I had had, and was still having, at home, might be profitably supplemented by my attending Tenishev School. This school one of the most remarkable in St Petersburg, was a comparatively young institution of a much more modern and liberal type than the ordinary Gymnasium"
The Tenishev School on Mokhovaya Street (where numbers 33-35 are now) in St Petersburg was the most expensive and liberal school in Russia at the time. It would have been attended by sons of the Russian aristocracy, but Nabokov nevertheless had his chauffeur drop him a couple of blocks away from the school gates for modesty's sake.