In all honesty you don't need to do any studying for that exam.
The cases are textbook cases or glaringly obvious; the OMT-requiring cases are also very obvious.
At the very MOST, review some OMT, but remember that you can do soft tissue / MFR / etc for just about anything.
Like you said, this test is a joke; treat it as such but give it enough attention that your $1000 won't go to waste and you have to return.
Don't bother buying First Aid CS...that's complete overkill...if you don't have the skills and basic knowledge to performa simple H&P, you're hurting.