Failed CGC once already — what actually helped you pass?

So I bombed my first attempt at the CGC exam back in March. Scored a 68 when I needed a 75, which honestly stung more than I expected. I thought I'd studied enough but the behavioral evaluation section completely blindsided me. I've got my retake scheduled for late June and I'm trying to build a better plan this time around.

I've been using a CGC practice test I found online to drill the obedience commands and temperament assessment criteria, but I'm still fuzzy on exactly what the evaluators are looking for during the 20-point test sequence. Does anyone have a solid study guide recommendation? Specifically something that breaks down the difference between a pass and a fail on the crowd walking and supervised separation exercises.

Also curious how many hours people are actually putting into prep. My dog Biscuit does fine at home but gets reactive around strangers, so we've been doing daily 30-minute sessions at the park. Any exam tips from people who've been through this twice would be genuinely helpful right now.