If Paid Case Interview Coaching is worthwhile? Anyone could share your experience?

I recently interviewed with two companies and was asked to solve a lot of business/product sense questions (very similar to consulting case interviews after I searched online). I do not know much about a case interview... really new to this kind of interview questions.. I do have many data analysis experience but coming up with a structured answer for an unfamiliar business case that interviewers love to see within such a short time period is still quite difficult for me.

Because I have another two onsite interviews coming in two weeks... In order to be prepared as much as possible.. I'd like to know if anyone has experience of working with a Case Interview Coach. How do you think of interactive coaching? Do you really benefit a lot from a few hours' talk? I see that a 1-hour coaching costs $90+.. I'm not sure if this coaching may be suitable for me who has little preparation on case interviews.. I greatly appreciate any advice!!!