Bootcamp practice exams vs real exam

Hi everyone, I was wondering if I could get some insight on the level of difficulty of the GC section on the real DAT compared to the practice tests 1-15. Are they more closely related to the first 10 or the additional 5 (11-15)? my scores decreased for those additional exams and just want to be well prepared. Also any tips & tricks on ORGO?? it's my weakest section by a mile