This professor doesn't deserve all of the negativity. I struggled in this class, but I really appreciated the effort he put into office hours. Going to office hours will really help you, so I highly suggest it. The worksheets really forced you to understand the concepts that he puts on the exams. Additionally, the homework and extra credit are really easy. Overall, CHEM 20A is a difficult class, but this professor makes sure you understand the concepts enough to succeed in the series.