CPP exam - which domains are the hardest and how did you study for them?

I've been working in horticulture retail for 11 years and finally decided to pursue my CPP designation this year. My manager got hers two years ago and said it opened doors for her, including a pay bump and being taken more seriously by wholesale reps. I'm hoping for similar results.

I started going through the American Nursery and Landscape Association study materials and the plant identification section is way more detailed than I expected. We're talking hundreds of cultivars across annuals, perennials, woody ornamentals, and turfgrass. I can identify most of what we actually sell, but the exam apparently covers plants I've never stocked or worked with.

The business management and customer relations domains feel like my strong suit since I've managed staff and handled inventory for years. But the integrated pest management section is giving me trouble — there's a lot of chemistry and regulatory detail I've never had to think about formally even though I deal with pests practically every day.

How many weeks did people spend on plant ID specifically? And is there a good flashcard deck or visual resource that helped you memorize cultivars? I'm a visual learner and reading descriptions isn't cutting it.