Hi
I don't actually know if it will help, but
www.celticrover.com might have something. Its a great site anyway when you come to take your final. I used it to pass mine.
Aside from that, if you can get ahold of the lab companion (which, I am told is available for download off the cisco site if you are taking the 801,... you should have the book if its the 607)... sit down with it, get on a router and just go through the work. When I did semester 2, our router lab wasn't working properly the whole time we were studying it, until about 2 weeks before the sem2 exam. I was quite worried that I didn't know the commands. A couple of days with that lab companion, and I knew quite a lot about commands and configuration.
If you dont have access to a router, you should be able to find simulations on the internet.
Hope this helps