each person's study techniques will vary.. so follow whatever works for you not what someone else says.
that said, I did basically nothing in undergrad until the night before exams. Then I would study all the high-yield stuff from the notes and maybe do some problems from the book to understand concepts. I never read anything from the textbook (although I did look at the pictures...) I crammed for all those classes; g. bio, g. chem, micro, bio-chem, o-chem, physics... looking back if I wasn't working/chilling all the time maybe I would've had time to study every day and would've retained more info (probably not though). it worked and learning how to stuff ridiculous amounts of info into your head in a short time is great practice for med school.
again, it depends totally on you. the key is being keenly aware of how much you need to know for the exams and how long it will take for you to learn it. People get into trouble when they lose track of this "inner sense of urgency", same as in high-school, college, med school, etc.