I didn't use Kaplan NBDE book, but instead used USMLE lecture notes for step one( Pathology, Physiology, Anatomy, Microbiology, Biochemsitry lecture notes)
Plus these books:
1-BRS ( Board Review Series) Microbiology and Immunology.
2-NMS ( National Medical Series for Independent Study) Biochemsitry.
3- Little Brown Book: biochmesitry.
4-Management of Temporomandibular Disorders and Occlusion by Jeffrey P. P. Okeson: I borrowed this one from UMN library. it is the best for occlusion Q's in the exam.
As you have observed, my weakness is biochem 😀 .
Well, good luck.