After 3 final rounds at various top props, I am pretty confident. In fact, they explicitly often look for people with no finance background whatsoever.
For what it's worth, your second point is somewhat valid - the questions they ask on the final rounds are unlikely to be on the various sites (after all, the sample size of people who got there is smaller, and they have less incentive to share their information). But as long as the OP understands the fundamentals of the other questions, he has prepared as much as he reasonably can.