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.
And what is it about drag-&-drop answers being reset when you do a review? How does that happen?
The system cannot remembered what you have chosen. If you review the questions, the answer will go away. So, you should either not to review the drag and drop questions or, as I do in in SCJP 5.0 beta, drop down the answer when you worked out the D&D questions.