I wrote the exam 9 years ago. I happened to be in email contact with a distant brewer (7 hours by car) who mentioned that his club might host a BJCP exam. I asked that he let me know if they did. And he did. Two weeks before the actual exam date. And I had just returned from my honeymoon.
I had been brewing for 2 years, and did all grain batches for almost all of that time. That was a good thing. It's not that kit or partial mash brewers can't write the exam, but it's important that you are intimate with the all grain brewing process. I printed the list of sample BJCP exam questions off the internet (I don't think the BJCP had a web site back then, actually) and then sat down and answered each and every one. I tried to go as far as I could without looking up information from books or the BJCP guidelines. When I got stuck, I cracked open the books to complete my answer.
Those answered questions became my study notes. I strongly recommend to anyone considering the exam that they do the same. I taught electrical engineering at the university level for 10 years, and I can assure you that if you physically write something down, it sticks. Simply reading is not an effective way to study.
Besides the nuts & bolts of the exam (the essay questions), you'll need to judge 4 beers as if you were at a competition. The only difference is that you don't have the luxury of the BJCP guidelines to fall back on while you do it. You'll need to know the guidelines very well. This is why it really helps to be an experienced all grain brewer - you have a distinct advantage if you're adventurous and like to try brewing new styles.
My trip to write the exam was spent either driving and being quizzed by my new bride or riding shotgun and cramming by the car's dim map light. A member of the homebrew club that hosted the exam put up my wife & I for the weekend. I judged for the first time ever with him the night before the exam. I strongly suggest that if you are interested in writing the exam that you practice judging beers - as many as you can - with other people. It doesn't matter if they're experienced judges or not (although it helps if they are), but do practice judging as much as you can. Other people will have different perceptions (aroma, flavour), and that will help you to clue in to unknown aromas or flavours. Don't leave judging for the first time (practice or otherwise) until the night before you write the exam.
I'm now a National ranked judge and I also serve as an exam grader. My club is going to host an exam this coming spring, and myself and a couple of other experienced judges are currently conducting a BJCP course. I wrote an exam guide which I've attached here:
View attachment The_BJCP_Exam.doc
You should also consult the BJCP's exam study guide
found here.
I mentioned this in the guide I wrote above, but I'll say it again because it's important. BE SPECIFIC. Don't write down "great colour" under the Appearance section for an exam beer. Describe the colour. Was it amber, gold, red, brown, black? How about the head? Was it white, off-white, tan, brown? Were the bubbles small & tight or large & loose? Did the head linger? Was it creamy or thin? Did it leave lace? Regarding the flavour, don't say things like "solid malt up front". Describe the malt. Was it caramel-like, nutty, raisin-like, sweet, grainy? Same thing goes for hop bitterness and flavour. You probably get the picture by now.
If you have any questions, post them here or PM me.