More students fail for one or more of these things than for anything else even remotely academic. They aren't really study skills, more like pre-study skills, even more like good etiquette. You're in school now. Don't waste everyone's time, especially your own if you're not ready to attend the 48 hours of class, do the 16 hours of lab work and do another 10 or more hours of written work outside of class. If your priorities aren't there now, then come back when they are.
Class is important.
No one will excuse you from needing to know the information that you missed while you're gone. No one is responsible for the material except yourself. There's no substitute for being there, so that you can hear people's questions and the teacher's responses. There are often things brought up that are not in the handouts and texts. That's what school is about.