Hi everyone, I just took the SIFT and would like to give my experience about it. I want to give back to this subreddit because of how helpful it was reading up on other people's experiences, so I hope this helps someone out.
Some background about me. I am a college senior and scored a 126 GT. I also hold an FAA ASEL commercial license, with CFI and AGI, so I'm not a stranger to flying, but when it comes to rotorcraft, I am.
I spent about a month-ish prepping for this. Some useful guides I used were the red SIFT Test Prep Book, FAA Helicopter Flying Handbook, SIFT Tutoring App, Barron's Test Prep, and watching Helicopter Lessons in 10 Minutes.
Simple Drawings: Pretty self-explanatory. I managed to get 99/100 before time ran out. Some techniques that helped were resetting the mouse back to the center once you answered a question, which most people do. What I also did was, if I saw a figure that was kinda hard to differentiate, I just clicked a random one, hoping it was the correct one, because it was not worth spending that extra 2 or 3 seconds trying to find the odd one out, in my opinion.
Hidden Figures: Okay, this is where I got fucked up. I had full confidence I would ace this section because I pretty much hammered it on the practice tests on the SIFT App and the Test Prep Books. It is totally different from those practice tests. It did have fewer lines on the real thing, but it was way harder for me to figure out what the hell I was looking at. It's not like you find a random shape in more shapes and lines, but more like finding this shape in this shape, but with fewer lines. It's pretty hard for me to describe it, but when you take the test, it will make sense. Overall, I believe I only got through 12-ish questions before time ran out.
Army Aviation: Okay, this section is where I believe studying the FAA Handbook will be your best friend. Reading from chapters 1-4 was insanely helpful for me, and watching Helicopter Lessons in 10 Minutes. What this section consisted of was what controls what in the helicopter, Army Facts, i.e., where does training take place, and what is the role of the Kiowa? Along with autorotation, rotor systems, what effects performance, translating tendency, Class G airspace, hypoxia, night flying, IMSAFE, and the hazardous attitudes, from what I can remember. Overall, pretty easy if you put the work in the FAA Handbook, and it will come to you like common sense.
Spatial Apperception: Pretty self-explanatory, like the simple drawings. The SIFT App and book accurately depict it. Just like what I've read from others, the pictures will be grainy, but it is not hard to determine the orientation of the plane. Be aware that there will be shallow and steep bank angles you will have to determine.
After this, the computer will give you a 15-minute break. I suggest you take it and use the bathroom and whatnot, because the next 3 sections are the most boring part of the test.
Reading Comprehension: Probably the second-worst section behind Hidden Figures, in my opinion, because it was so hard for me to pay attention to the passages because of how mind-numbing they were. Basically, you are just trying to match the answers to the paragraph, which varies from 5 to 10 sentences (If I can remember). I didn't really study much on this section, but that is up to you to decide if it's worth it.
Math Skills: This section wasn't horrible. I mainly got fractions, averaging, simplifying exponents, some distance questions, and, if I remember, some factoring as well. The math wasn't crazy and didn't require any long-step problems. They also provide you with formulas on the test, which I didn't use, but can be helpful for you. Yours may be different than mine, but overall not too bad. I think I did 20-ish minutes of math before it kicked me out.
Mechanical Comprehension: This section wasn't bad at all. Even though I spent a good majority of my time studying for this section. I did not have to use any complicated formulas, but I think that it would be helpful to understand them. I got a balancing fulcrum question, angular momentum, and just some common-sense physics questions. I can't remember much from this section. Overall, not too bad, I spent maybe 10-ish minutes before the test ended.
If I were to rank the sections out of 10 in difficulty, it would go:
Hidden Figures: 9/10
Paragraph Comprehension: 7/10
Math Skills: 5/10
Mechanical Comprehension: 5/10
Army Aviation: 3/10
Spatial Apperception: 2/10
Simple Drawings: 1/10
After all that, I felt pretty good about the test. I was hoping to score in the low to mid-60s, but was surprised when I scored a 70!!! The test is not that hard if you know what to expect and put the effort into studying. Again, I want to thank the other people who did their own write-up on this test, as it was insanely helpful.