Same deal here. We've been migrating to Juniper as well. They have that commit check which is awesome if you don't want to isolate a node. What are you using to study? I have the JUNOS as a Second Language my OJRE and AJRE books and an AJRE Flash CBT. I've been looking around for something on OJRE Flash CBT, without any luck.

Also, are you studying for the M Series or ER?