I’ve been taking certifications for over twenty years. Most of them blurred together. Study for weeks, memorize a bunch of stuff, dump it into an exam, forget half of it by dinner. You know the drill.
The CISSP was different. And I mean that.
This is probably the most well balanced exam I’ve ever sat for. It covers enormous breadth but it doesn’t punish you with absurd depth in any one corner. It checks whether you actually have a handle on things, not whether you can recite page 347 of a textbook. I walked out genuinely respecting the exam, and I can’t say that about many.
Here’s my litmus test for certs these days: if an exam is mostly memory recall, it’s the wrong exam. We live in an era where AI can look up anything in seconds. The certifications that are going to matter going forward are the ones that test judgment, the ability to read a messy situation with incomplete information and land on a sound conclusion. The CISSP does that. That’s why I think it’ll age well while a lot of other exams won’t.
Now, the important caveat. I prepped for three days. A long weekend. That is absolutely not a recommendation for everyone. I have 21 years of experience across security, identity, infrastructure, risk, cloud, development, you name it. I’ve lived these domains. The three days weren’t about learning, they were about recalibrating my instincts to match the ISC2 way of framing things.
If your background is similar and you’ve been putting this off, keep reading.
YouTube Was My Go-To
Before I even opened the CBK or fired up an AI prompt, I went to YouTube. It ended up being the single most valuable learning resource in my prep.
Destination Certification’s mind map series was the backbone. Each domain broken down visually, explained clearly, no fluff. I’d watch a domain, pause, ask myself what I actually retained, and move on. When something didn’t click, I’d rewatch that section or dig deeper elsewhere.
Beyond mind maps, I spent a lot of time watching recent exam experience videos from people who had just taken it. Not the ones from two years ago, the fresh ones. People sharing what surprised them, what domains hit harder than expected, what advice they’d give themselves if they could go back. That was gold. It gave me a real sense of what the current exam actually feels like, not what a study guide thinks it feels like. I also picked up practical tips and tricks from various creators, things like how to manage time during the adaptive format, how to read questions without overthinking, when to trust your gut versus when to slow down. Small things that add up.
If you’re someone who learns better by watching and listening than by reading walls of text, YouTube alone can carry a huge chunk of your prep.
AI Was My Study Partner
I leaned on ChatGPT, Claude, and Gemini, and honestly it was one of the most efficient study experiences I’ve had.
ChatGPT was my sparring partner. I’d tell it to throw scenario questions at me from a specific domain. Get one wrong? I’d ask it to walk me through the logic. It was like having a patient tutor available at 11pm when I was half asleep on the couch still grinding through Domain 1.
Claude was where I went when something didn’t sit right. Governance, legal, risk quantification, areas where the ISC2 perspective sometimes clashes with how things actually work in practice. Claude was good at laying out the reasoning slowly enough that I could see where my real world bias was leading me astray.
Gemini filled the gaps. Quick definitions, cross checking terminology, sanity checking when the other two gave me slightly different angles on the same topic.
Through all of it, the ISC2 CBK was the final word. AI is fast but it can be confidently wrong. When something mattered, I went to the source. That combination, AI for velocity and the CBK for accuracy, worked really well.
Three Days, Eight Domains
Day one was about confronting my weak spots. Domain 1 (Security and Risk Management) and Domain 3 (Security Architecture and Engineering) don’t come up in my daily work the way other areas do. I spent most of the day bouncing between YouTube mind maps and AI generated quiz sessions. When I disagreed with an answer or felt unsure, I went to the CBK. That loop, watch, quiz, verify, was the whole system.
Day two was the other six domains. Some of these, like IAM, network security, and security operations, are my bread and butter. I skimmed the mind maps to catch any ISC2 specific framing I might miss on instinct alone, then moved on. Asset Security, Security Assessment, and Software Development Security got more of my time. The back half of the day was full practice runs, AI generated questions mixed with YouTube quiz walkthroughs, simulating the real thing as closely as I could.
Day three was light. Reviewed the things I’d flagged, rewatched a few key mind map sections, reread a couple of CBK chapters that still felt fuzzy, and shut it down after lunch. There’s a point where more studying just makes you second guess yourself. I wanted to walk in clear headed.
What the Exam Actually Felt Like
A lot of people online will tell you the CISSP is all about “thinking like a manager.” That advice gets repeated so often it’s basically scripture at this point. And it’s useful, when the question is actually asking for a managerial perspective. But there were definitely questions that went deeper than I expected, things around protocol behavior, networking fundamentals, and how certain security mechanisms actually work at a technical level. If I’d gone in blindly applying “think like a manager” to everything, I would have burned time and second guessed myself on questions that were clearly asking for an engineer’s answer.
The exam is a blend. A real blend. Managerial judgment on one question, hardcore technical depth on the next. I found that refreshing. It respects the fact that security leaders still need to understand what’s happening under the hood.
I never felt like I was being tested on memorization. Not once. Most questions gave me four options where two or three were reasonable, and it came down to selecting the best or least risky choice after eliminating the ones that clearly didn’t make sense. It wasn’t about knowing the right answer, it was about knowing why one answer was better than the others. That’s what made it feel fair.
What I’d Tell You If We Were Grabbing Coffee
If you’ve been doing this work for a decade or more and working across multiple domains, you’re closer to passing than you think. The knowledge is already there. What you need is a focused effort to see it through the ISC2 lens, identify the one or two domains where you’re rustiest, and sharpen those.
I’m not telling you not to study. I’ve done plenty of certs where I needed months and I respected that process. But the CISSP is uniquely suited to experienced practitioners. It’s testing whether you’ve internalized security thinking, not whether you can cram. Your prep should match that. Assess your gaps, patch them efficiently, and go sit the exam.
Stop overthinking it. Stop waiting until you feel ready, because that feeling never fully arrives. If you know this material from living it, trust that.
You know more than you think you do.
