i hope things get better for you. if you have a teacher worth anything (and i had one who honestly couldn't do this) he/she'll be able to give you pointers on what they're looking for and ways to approach the material. also, the suggestion about talking to students who are doing better than you is also good. joining studygroups with those people can also be helpful because doing things solo isn't always the best.
for me to suceed, i had to do the study group thing, make my notes, re-write my notes, study the lecture/textbooks, say it, read it again, write it again......you get the picture. it sucked, but it was worth it cause i finished in december '06 and lived to tell about it!
to get there though, i failed two classes at my original school (which was th limit) so i had to transfer to another school 4 hours away--a place where i'd only have to repeat one class. it ended up okay and i know what you're going through, but if you do everything that's been suggested here, you'll be fine.
trying to do it alone was my biggest mistake. the people who succeeded were in studygroups 98% of the time and it obviously worked for them!