I agree with what has been said up to this point. The little exposure I had to Kaplan VR (their free diagnostic) ended up being very unrepresentative of what I found on the real MCAT. I didn't use EK, but I did use the AAMC online practice tests, which were also more theme and tone based. I felt comfortable going into the exam after using those and felt good coming out. They ended up being very representative of what I found when I took the MCAT for real. If you haven't used the AAMC ones yet, consider trying it. I think exam 3 is free.