Don't use ti becasue you don't need it. Dat Achiever is really good for PAT and math and they are god in sciences as well. it is harder than the real deal which is good becasue if you can do that you will do well on real deal. I would also recommend Top Score as well. Good practice test and close to real deal. I used only Kaplan blue book(didn't take class), TS and Dat Achiever and in my opinion they are more than enough to get you a good score.