I'd be willing to wager what you want exists, but I won't be the looking those studies up for you. I did find a good synopsis of the types I'm talking about on Google...
https://www.r1consulting.com/baby-b...-in-the-workplace-a-melting-pot-of-expertise/
Prior to medicine I ran regional operations for a large national company and consulting groups like the one above hovered in our lobby much like pharm reps harass doctors. This is the type of analysis held true, almost universally, I can't tell you how often millennial parents called in for them and tried to litigate their problems or negotiate their compensation. Point is there are differences.
With differences comes strengths and weaknesses. The fact that you're arguing none exist tells me you're further from my age chronology or experiencially. What works for one won't necessarily work for the other, that's my overreaching point. Just like differences in children, simply working harder isn't always the answer, there may be gaps in learning, reading issues, or instructional problems. The ladder is what I illuded to earlier.
Medical school is a dinosaur. As research progresses, deeper clinically insignificant facts creep into our slides, get tested, and fall by the wayside. Young medical students have a hard time seeing past Monday's exam and they prepare for it, do well, and forget. 80% of the test was relevant and important, the rest was one animal study away from useless. I suspect the OP isn't getting many of the remaining 20% correct. Since he is a hands on learner, something he should know, he's likely having trouble creating useful scenarios to form memory the hooks needed to retain this information. I am telling him not to worry about that, move on.