alright i got a question for y'all experienced in this field

i took my first nbme 3 weeks ago...scored a 490/219

studied, did kaplan qbank and re read all my texts

1 week ago took nbme 2...scored a 560/232
started USMLE world....been scoring between 70% on last few random tests with an overall average of 67% with like 40% of the bank taken


then i took form 3 and got rocked got a 520 or whatever correlates to a 224....basically i found the exam really hard and dropped a lot esp in strong areas


overall im askin are certain nbmes easier than others or harder? i know im still not failing and some people would like those scores but im aiming for 240+ and killing myself....just wonderin wats goin on and im also slightly delerious from studying so if this post is rambling sorry haha. any further advice appreciated as i write in exactly 14 days