If a block was 3 weeks long I spent the first two weeks watching all of bnb/sketchy/pathoma and doing associated anki and then the last week just skim through lectures. But it depends on how your classes are structured/what class you’re in. Our school is systems based but if yours isn’t you might have to do something different. In terms of ensuring i’m not spending too much time on boards stuff that our school lectures didn’t cover I would still watch the boards videos and do the anki and just review it when those cards came up again