CTC exam — how much clinical experience do you actually need before sitting?

I'm a licensed clinical social worker with about 4 years of experience working with youth in foster care. I've been seeing job postings listing the CTC as preferred or required and I'm trying to figure out if I'm ready to sit for it. The eligibility requirements mention trauma-specific clinical hours but the exact number isn't super clear in what I've found so far.

From what I can piece together, the CTC is designed for clinicians who are already doing trauma work, not people trying to break into the field. The exam covers trauma theory, assessment tools, intervention models, and ethical considerations specific to working with trauma survivors. I'd say about 60–70% of my caseload is directly trauma-related, mostly developmental and complex trauma in kids aged 6 to 16.

I've been doing about 3 hours a week of focused reading on trauma-informed practice for the past 2 months and I feel like I know the theory well. My weaker area is probably the specific assessment instruments — there are so many and I haven't used all of them clinically. Does the exam expect hands-on familiarity with tools like the CPSS-V or CATS, or is it more conceptual knowledge of what they measure?