Are any of these servers what you are looking for?

Servers with "Training" and "Server" in the name:
[JP] BOT Training Server No.4 - Beginners Version
[JP] BOT Training Server No.3 - Expert Version
[JP] BOT Training Server No.2 - Normal Version
[JP] BOT Training Server No.1 - DeathMatch Version
Elite training server
YOUNG training server
Training Server
Training Server
zLACER Trainingsserver by dawn-server.de
PING.online.ua CS 1.6 HNS Training Server