One tool I found useful during my study and preparation was the ABC Calculator for FE preparation, by Joel Erway.
There are many online links and articles that discuss it, including a number of YOUTUBE videos he created.
I am attaching a copy of the one I populated and used during my FE study/prep (I sat for the Electrical and Computer FE exam):
View attachment ABC_CALCULATOR - Electrical and Computer FE.xlsx
I give that tool some measureable credit for my being able to pass the FE the first time I took it last December - though they never told me my score.
The only thing I would change in the tool, if I had do my preparation over again, would be to break-down each of the major topics into the specific sub-topics (shown as Chapters in the PPI reference). In my case, since I never took 'Differential Equations' as one of my undergraduate Calculus courses, I really had to spend a lot of time learning DE theory/techniques, along with all of the associated transforms - especially Laplace transforms. One benefit of using that tool, was a focus on the types of problems that I had the least chance of solving, and in my case those Laplace @#$%&. In fact, I decided before going into that computer-based test, that if I saw any problems that looked like Laplace (the small 's' in either the numerator or denominator of a problem or its answers), that I would try the first one, then guess at any others I encountered. Well, as it turns out, I saw about a dozen of those problems on my test, distributed between the math, low/high-pass filters, and control system problems. When I wasted three-minute on the first one I came across, I just guessed the same letter ('B' I believe) on every other one I encountered. That saved me over half an hour, which I was able to use on problems I had a chance at solving