^^Agreed. Most sophomore organic courses build on a relatively small number of key concepts taught at the beginning of the first semester. Keep on top of it from the beginning. If you don't completely understand something, don't wait to get help. Go over your notes between classes and work problems as the topics are covered.
I believe the reason organic gets a bad rap is that students that usually get away with poor study habits like cramming a day or two before the exam suddenly find themselves struggling. If you establish a routine and don't let yourself get behind, it's not that bad...
but you still aren't guaranteed an A
I'll add my own input. I am one of those students that usually gets away with an A by cramming the night before an exam.
This was a horrible mistake in organic chemistry. I got a C+ in ochem I and a C- in ochem II (that was curved from a 56%, too, to give you an idea of how poorly I did).
However, I am currently re-taking organic chemistry II (not a good idea to rely on this-- it is costing me $1800 plus parking in the city; more than half of what I will make this summer), and I've really stepped up my study habits. It's going to be extremely difficult for me to get an A, because I did not pick up all the skills I should have in ochem I, but it's never too late to get back on track. I got an 85% on the first exam, which I was happy with (the average was a 68%), and I have not yet gotten my second exam back, but I actually expect an A; I think I did really well on it. I may get an A overall in the course as well, since the instructor curves a bit at the end.
So especially if you are going to have to take ochem II, please do not do what I did. It was horrible, and I have made things much harder for myself in the long run, and not just in school (medical schools do not like to see Cs). Study hard, ask for help, do homework problems repeatedly (once is usually not enough), and you may get an A. If you get at least a B, though, that still looks good to med schools, because they know how difficult the course is. And you are definitely not out of the running if you get a C, but if you put the effort in, you should be able to get at least a B.