Flugbuch of Wilhelm Kaufhold - FA 330 questions

[Stig Jarlevik]

I was intrigued by the find of his F-buch here:
https://www.ebay.de/itm/235719865145...90.c101224.m-1

First of all his glider training where we still in 1943 find WL registered aircraft.
Obviously nobody had bothered to remove the WL prefixes.

Secondly I have never before come across what looks like FA 330 training.
Seems it started with towed take offs from the Autobahn and later continued with towed
take offs from the Zuider Zee.

Would this have been the normal training procedure?
Also there are a lot of digits when it comes to individual FA 330.
Would anyone be able to explain these numbers please? WNr??

Cheers
Stig