Statistics should serve as a guide for the practical and well-informed, not as a crutch for the timid and unrealistic. If you don't do well, then you will have to make a substantial change if you want to get a grade that is substantially better than your first test score. But a few students who didn't get good results were probably spending way too much time in the first place, because they were trying to swarm around and surround the material, rather than approaching organic chemistry intelligently. You see, as those principles apply to 100,000 molecules don't learn them one molecule at a time. And remember that the problem sets that are available to students in the book and on the web are the way they can and should test themselves repeatedly as to whether their grasp of the principles of Organic Chemistry is adequate.
Organic chemistry is remorselessly cumulative.
If your approach to it is intelligent and remorselessly persistent, success should by and large be yours. And your professor, in this case me, as well as the TA's are here to help you stay on the right track. You don't need to be a genius. Some geniuses get into trouble because they don't think the need for persistence applies to them. The pace of the material in high school is such that they can do very little for a while and then catch up with a few hours of work.