4xISACA, 2xISC2, 2xGIAC,1xIAPP certs. 35 years in the industry.
I always give myself 3 months to study for an exam, I first did the official ISC2 online training (i.e. watched the videos) to get a feel for the course/certification. After that I did the training exam. Then I spent about 1.5 of the 3 months to read all the material. Stopped reading about one week before the exam.
I spent the bulk (80%) of the time reading NIST 800-160, NIST 800-37 and IATF 3.1. I did not read PMBOK or INCOSE at all (except the incose PDF-document that was linked in the course).
I normally use pocketprep but it was not available for ISSEP, tried cccure and udemy practice exams but it felt like those very made for an older version of the exam and the content did not align with the ISC2 course. So I used the training exam instead.
I found the exam very hard, I was convinced I had failed.
Congrats! I'm curious, why did you not bother diving into the PMBOK or INCOSE? Was it because you were already familiar with the material or because you felt like it wasn't going to be a huge part of the exam? Maybe a little of both?
Without disclosing too much, can you expound on why it felt so difficult? Was it just the nature of the questions or some topic you should have studied more?
I saw INCOSE being mentioned here in the forums but it isnt on "the list" https://www.isc2.org/certifications/References. I have been working in projects, as a technical project manager and project manager and getting the PMBOK was expensive so I decided not to buy/read it.
English is not my native language, so I would say the language in the exam. I have passed CCSP and CISSP, but I feel this was more complicated language in the questions. Also I feel that normally the last 20-25 questions in the CAT test modell are somewhat hard, but here I struggled with the last 40-50 questions and used up much more time than CCSP/CISSP.