Are the older NBME's still an accurate predictor of Step1 Score?

[EmtBaMphMd]

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Have taken the NBME's (13, 12, 11, 7, & 6) and after another round of focused review am two weeks out from the test. Would like to take another NBME but am concerned that the earlier NBME's won't be a true predictor of the my score. Of the forms 1-4 which is closest to the real test?