Im going to tell you mainly about the stuff that, unless you are an AE engineer, may be difficult for you to know.
There were a few FAA rules and regulations. One of the questions was something like "What is the FAA required safety factor for a utility aircraft?" and you have choices for like 2.4, 2.8, 3.2, 3.4. I put 2.4 because a utility aircraft carries cargo...doesn't need a high safety factor because if it crashes only the pilots die
not sure if it was right though but that was my reasoning. Also, it asked questions like "What do blue lights on an airport indicate?" taxi-way, and "What lights show on an active runway?" white. "What does a flashing green and red light on top of the control tower indicate?" Exercise extreme caution when approaching the runway because the airport is unsafe for landing. Know what classifies an airplane as "high-performance" - More than 200 hp engine.
You will need to know about wings/airfoils. Know what creates lift (Pressure difference between the upper and lower surface of the wing), know Bernoulli's principle, know what camber and chord mean in reference to wings and airfoils. Know aspect ratio in reference to wings, know what monocoque, semi-monocoque, and open truss refer to. Know what an elevator controls, what ailerons control, what rudder controls. Know that the 4 forces acting on a plane are lift/weight and thrust/drag.
The math section can be difficult...I had only about 30 sec. left when I finished it. It asks some stupid questions...the one I remember was "A ranch raises ponies and horses. If 5/6 of the ponies have horseshoes and 1/2 of those ponies are Icelandic ponies, what is the minimum number of ponies the ranch can have?" Then they give you choices...turned out the answer was 12. The only reason it was 12 was because the other choices were 15, 17, 19. Multiply any of those by 5/6 and you dont get a whole number. Know fractions and geometry, it will help.
As far as the reading goes, that seemed really simple to me. Just read the passage and they give you 4 choices of things that you can infer directly from the reading. Some of them may or may not be true, some don't pertain to it at all, and one is dead on. One I remember was like "Galaxies are classified as having 100 billion stars or more. These galaxies rotate and are generally disc shaped. The galaxy in which we live is called the Milky Way and has a large bulge of stars in the center almost 300 million light years across." The answer turned out to be something stupid like "Galaxies have distinct attributes".
The mechanics can be difficult. KNOW PULLEYS!!! The pulley questions were most predominant. They wanted to know if you pull x feet on this rope how far will a block raise. Also they want to know how hard you have to pull on a rope to lift a block of x weight and the rope travels through multiple pulleys. I for the life of me couldn't remember pulleys because its been 2.5 years since I took a statics/dynamics class. They also focus on, "If this gear moves this way which way is this other gear going to move". Know about forces and moments.
The spacial perception was easy for me too because I have played a lot of flight sim games. They give you a picture and it will be tilted at some angle and you have to pick out which airplane picture represents what you are seeing.
The last section is just a recap or a summary of all the other sections. Some of the questions even came directly from the other tests.
If you get the aviation test prep book and study it then you won't have any problem. The questions in there are almost exactly like the test. One exception is that the reading section didn't have anything like "Find the word that doesn't make sense in this paragraph and replace it with a word from below." I was glad it didn't have that.
Anyways, that is about all I can remember right now. Good luck and if you have anymore questions about the test don't hesitate to ask.
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Oh, great job on your test!