I presume you have already found the PLTA web site that discusses how to apply to become an agent.
As for what's on the test, I don't think you'll find an example anywhere on-line. I suggest reading the TIRBOP Manual and the jackets for Commitment, Owner and Loan Policies. That material along with your base of transactional knowledge will likely get you through the test.
The jackets are really important. Now, here's the big question, have they updated the test for the 2006 ALTA policies? I don't know. To be safe, I would study the old jackets AND the new jackets.