This is my second year for applying. I bought the Kaplan book last year and did not take the class. I noticed that there is a "new" edition this year. Not wanting to part with hard earned dollars, I took my "old" book to the bookstore, sat down with the "new" book and flipped through the entire book. They are page-for-page the same book. Identical sections, materials, spacing, paging, sample test at the end of the book and answers to the questions. It is as if they took the old book, placed it on a photocopier and wrapped it in a new binding.
The two books are identical in every aspect but one. The table of contents indicates in the "new" version that the "how to use the cd" section starts on 815 where the "old" version indicates that it starts on page 813. The section in both versions starts on 815- the table of contents on the "old" version directs you a page early.
I did not check the disk(both editions come with a cd), since I did not buy the "new" version, although I did notice all of the instructions are verbatim the same-same system requirements, etc. I was very satisfied with the "old" edition cd-it is simply a version of the DAT very similar to the one you will be facing at the testing center. The CD does not have a passwork. Save your money, buy the old version.
I do recommend the Kaplan Organic Chemistry Edge-2nd edition (current version) which can be bought on amazon for $8 plus shipping.