Do you mind sharing what you did when you overhauled your approach? Failed the first time this time around, but hoping to take it again in October.
I don't know if this will be what you're looking for, but a fellow geotech test taker asked me my preparation and approach to the exam. This can be applied generally and isn't specific to geotech. This worked for me. Some key points to remember are to keep your cool if you don't know how to do/have never heard of a problem. You're not expected to know everything. Also, remember that this is a standardized test and there are certain skills and methods that can be applied to standardized test taking that will boost your scores. Here's what I told him:
For my preparation, I didn't use a prep course, so I can't really speak as to which one may be good or bad. I bought the NCEES practice test so that I could get a feel for the difficulty and types of problems that might be on the test. I specialized in geotech in graduate school, so I then studied materials that I had from coursework. My approach was to review general geotech stuff from my soils course just to get back in the swing of things and jog my memory a bit. I then went over the list of topics provided by NCEES and practiced numerous problems of each type and tested myself with more difficult problems as well. After doing this, I focused on doing problems in areas that I struggled with. As for the morning portion, I studied all of the topics provided on NCEES's list and then focused particularly on structures, as that's not my best subject. A week or so before my PE exam, I took the NCEES practice test in it's entirety to get a feel for how the 8 hr test would be and to practice my strategy with time management. For time management strategy, I would read a question, If it was easy and wouldn't take long, I went ahead and worked the problem and answered it. If I knew how to do the question, but it would take a bit longer, I marked it as a "1" and came back to it after I'd done all of the easier quick ones. If I didn't know how to do the question, I marked it as a "2" and came back to those at the end. I ended up having plenty of time for both morning and afternoon sections, about an hour or so of time after I'd answered about 90% of the questions. For the questions I didn't know how to do, I took my remaining time and looked in the index of my text books, etc. to see if I could find answers to questions. Don't forget to do a little bit of review on geology and simple facts about soil. Usually reading the first chapter or two of a geotech text book will provide a good review on geology, soil types, how soils are transported, etc. I hope this helps. Let me know if I can help you out!
Also, a few things to remember: There will be questions that you read and don't know how to do and think "what the hell are they talking about?" Don't let these make you nervous, I promise nobody knows all of the subjects. Just keep your cool and move on to a problem you do know. If you use my time management strategy, you'll gain confidence up front doing problems that you know how to do and you can use that momentum to get you through the rest of the test. Also, remember that this is a multiple choice test, so use some some standardized test taking skills on problems that you don't know. Look through answers and try to eliminate a few that you know are incorrect. You don't actually have to know how to do the problem to get the right answer. For example, Let's say you have a cantilever beam with a load placed in the middle and you're asked for the shear at this point. Assume you don't know how to do the problem if the load is in the middle, but you do know the shear at the left end and the shear at the right end of the beam. You know that in the middle, the shear will be some value between the shear value at the left end and the shear value at the right end. Although you don't know how to get the actual answer, if there is only one answer between the value of the shear at the left end and the value of the shear at the right end, you can still get the correct answer without knowing how to do the problem. Even if there are two possibilities, you can guess and have a 50/50 chance at getting the problem right. I guess the takeaway here is that on problems you don't know exactly how to do, try and eliminate a few answers to increase your chances if you have to guess.