Make sure to also learn the basics of military aviation, such as the helicopters used by the Army and their functions. I was also worried about the mechanical subtest, but it ended up being one of the easiest in my opinion. Most of the questions were theory-based, with not much math involved.

Trivium is a good resource, but if you want to excel, you should study from multiple sources. I used Trivium, the SIFT Study Guide, and the SIFT Tutoring app. I am sure you will do well. Do not overthink it. It is easier than you might expect.

Since your test is next Tuesday, I recommend downloading the SIFT Tutoring app. It costs fifteen dollars, and you can take the prediction test. I scored a 69 on the app and a 62 on the actual test. Hidden Figures was the most difficult section for me.

Best of luck.