Funnily enough, I've found that the tutorial has been removed from the Reward Book (unless I'm missing something...). I suggested in another thread that the developers should create more Reward Book content featuring AI battles like the tutorial, with attached story. That'd certainly help make the Reward Book a little more interesting.Currently practice mode is only against Arachas Queen. Looks like CDPR is still working on the other opponents. So we‘ll have to wait a bit for more.
You can replay the tutorial by checking out your rewards book. Just look for Geralt.