The ATP written exam test guide is for the written FAA exam. You do not need to study that for a B737 type rating. If you study what I have mentioned above you should be just fine. Just out of curiosity, isn't your school advising you at all? They should be if they are worth anything.
Since you are also getting your ATP with your type rating, you can also expect to get up to altitude and get a high dive on your simulator checkride.
The FAA PTS has also the required items for the ATP check as well as the tolerances.