Okay so I just got my results back this morning and I passed with a 78. I honestly cried a little because I failed by four points the first time and spent the last six weeks convinced I was going to fail again. If you're in the same boat, keep reading.
First attempt I went in pretty confident after reading through the official study guide once and doing maybe 10 hours of prep total. Big mistake. The actual exam has a lot of scenario-based questions that trip you up if you've only memorized definitions. What made the difference the second time was drilling with a GTS practice test almost every day — I'd do 20-30 questions, review every single wrong answer, and figure out WHY I got it wrong, not just what the right answer was. That sounds obvious but I wasn't doing it before.
A few exam tips that specifically helped me: don't rush the situational judgment questions, they're designed to have two "good" answers and you need to pick the BEST one. Also, the technical content around safety standards was heavier than I expected — probably 20% of my exam. Budget extra time there if that's not your background.