Subject-wise,
- Anatomy & embryology & histology (52/61/59); there was an improvement in NBMEs
- Behavioral science & biostatistics (59/62); there was an improvement in NBMEs,but weakest NBME6
- pharmacology (63): also an improvement in NBMEs
Subdivision-wise;
- Cardiovascular (65/59): Cardiovascular was average in NBME6, worse in NBME5. Vascular component was lower, but had less questions
- Dermatology (51): MSK was weakest in NBME6
- Genitourinary (62) and renal (60): Renal/urinary good in NBMEs, but genital-endocrine was weakest in NBME5
- Head & neck (60): MSK was weakest in NBME6
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Overall anatomy has the lowest percentile, and MSK was your weakest subject in NBME6. Also, subdivision wise, head&neck (which is quite anatomy heavy) and dermatology also had low percentile points. From this, I think MSK anatomy might be a weak point. (Upper&lower limbs, head&neck). When you add dermatology to that list, going over the entire MSK section might be high-yield.
There was also improvement in behavioral science, but subjectwise it has the 2nd lowest percentile. Going over it again might pay off.
After those, going over pharmacology (63) -maybe you can try to identify which part of pharmacology is the weakest- and genitourinary and renal systems (62 and 60) looks like a good idea, especially the genital part.