I took my FOI a couple of weeks ago. Let me tell you that the Gleim/ASA and all the other books/software are OBSOLETE at this moment. The lowest score that I received in the practice test was 92%. In the real test I received 50% pretty bad. A few reasons why I failed.
1) I only studied the questions from the study guides and the brief chapter description from the study guide. I did not even open the Aviation Instructors Handbook.
2) The questions were really ambiguous on the real test Its been a couple of weeks since then, and I still don't feel confident enough to re-take the test. The questions are based on the Aviation Instructors Handbook and they can ask the most random questions out of this book.
3) The test is mostly Psychology based unless you have a Degree in this field you really need the time to study the book because the questions are so dynamic that I didn't even recognize most questions from any of the brief Chapter descriptions in the Study Guide.
So out of 50 questions I recognized 5 this is huge because I studied the Gleim 2011 FOI, the ASA CFI software, and exams4pilots.