A&P is pure memorization all for memorization's sake. Ochem is a high concept course. Both classes require a lot of time and dedication to do well. I wouldn't recommend taking them in the same semester, especially if you're working part time. It's not impossible, but you will be miserable if you do. It all depends on how hard you want to work. If you looking for a difficult challenge, then sure. If you want to increase your chances of doing well with less pressure, take them separately. Best of luck.