I know that feel, bro.
There are some great notes on this site, definitely worth a read (or many). Read the afterword, read any summaries or notes you can find on Google (if you can't find any, search harder). Otherwise re-read key sections and beast essays from your peers (or the whole book if you're a super fast reader* in addition to AN notes to reinforce the good bits).
Edit: VivaT said this in another post, you'd do well to take his advice
How I did it:
- Read the book once before we began studying it
- Looked up summaries on the net
- Skimmed through study guides
- Paid attention to class discussion
- Looked up character profiles on the net
- Re-read a few parts of the book
- Read a few critical analyses of the text closer to the SAC
- Researched a bit on the religion
How you should do it:
- Same as above, except with reading the book more and knowing it better
I did reasonably well, but I could have actually spent much more of my time studying English, and studying effectively at that.