This is going to sound hilarious but I'll risk being ashamed for it...
Organic Chem--I bought myself some poster paper and had all the main reactions (not single reactions, just trends etc) on that ONE POSTER....any time I was in the room, while watchign TV....before bedtime, I kept looking at it passively and somehow it worked. On the bus, I did notecards, in similar format to the poster.
Biochem--had all the main Krebs, ETS blah blah drawn out like a little diagram (do NOT copy from book, write it in a way that YOU like it, sorta like you're coming up with your own formula) again on poster paper that hung on my bedroom wall for about a year.
I kicked some rear end in all of those classes. Obviously, something worked!