This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
You are correct, Dan's test questions are tougher than the ones you might expect on the actual SCJP1.4. But if you can do good on Dan's, I am sure you will fare good on the real exam. Marcus Green has a good set of test questions, pretty close to the ones on the real test. Check this for more mock tests.