I studied only for 2 weeks with schweser and did CAIA online mock exam just once. It was challenging for me because of very short time I had studied and I won’t be surprised if I fail but I think anyone who had studied CFA L2/L3 with investment background should comfortably pass with just one month of serious study.
I found AM quite easy but PM equally difficult. In PM there were many ‘option view’ questions and hedge fund questions that I just had to guess on. Overall exam seemed easier than the CAIA online mock exam.