Sorry to hear you’ve had a rough year. You sound like you have a decent attitude about it and have been trying to fix the issue. Given how close you were, you have a decent chance of passing the second time around.
Usually I can read between the lines in a post and sniff out the underlying issue but I really can’t here. Significant study habit issues would have nailed you in M1 unless you just barely passed and your school has a much higher workload in year two. I don’t buy the too much minutiae argument because then your whole class would have failed. What were class averages on those exams where you got 65? I ask simply because the spread points to different underlying issues. If the avg is 71 then you just have poor faculty. If the average is 85-90, then you have a more serious issue and may struggle on boards and later on shelf exams.
The biggest mistake you can make is going into this year thinking you’ve got a leg up on studying because you’ve done it once before. Treat it like it’s your first pass and throw all your effort into acing your class exams. Forget about boards for awhile - you can use those materials to codify concepts but devote the bulk of your time to memorizing the minutiae. Once you are comfortably passing, you can devote more time to step prep, but not before then. It’ll be tempting to do because you’ll think the higher step score will make up for the failed year, but you run a high risk of failing the year again.
If I were in your shoes, I would look hard at your weakest areas and use the summer to build my own anki cards for all the class minutiae for the whole year. You already have all the course material, so use your time to make cards and prepare to beat the class stuff into your memory.
The one missing element from your described study is repetition. It sounds like you did a lot of superficial passes of different resources but that simply isn’t enough. Reading Robbins is a waste of time — reading Robbins 4-5 times is what you need to do. Watch pathoma 2-3 times until his voice is in your head. I like anki for repetition because it automates it and if used far enough in advance will ensure you devote all your time to your weakest areas.
Good luck!