Best way to prep for PE case studies / developing investment framework?

Have some pe interviews coming up and feel heavily underprepped for the case study portion.

Would love to know how to develop a framework to tackle case study portions. Framework as in how you think about a company, its position, and its industry. Any helpful resources? Or is the best way to just practice cases and if solutions are available looking through them.

Was thinking about reading books on strategy (porters five forces, competition demystified, etc...) but this seems like a low roi approach given the length of books and broad approach. happy to approach it this way if anybody found success doing it like this. but im on a time crunch and would greatly appreciate some focused prep advice from anydboy who found success.