yeah Kaplan is enough for Step1, you may also use the crash course anatomy textbook, and if you are a visual learner i recommend Dr.
Is Kaplan helpful for USMLE?
Kaplan notes are absolute best review source for USMLE. There is no doubt that it is high yield and one should not attempt USMLE without preparing from them.
Is Kaplan enough for medical school?
Kaplan is only and only suitable for the US medical folks. Reason being, there is a difference in the curriculum of Medicine course in India and US. Kaplan is a US-based company providing recorded lectures to the students aspiring to clear USMLE.