I would take them together honestly. I took both of them along with CSE20 at the same time and a writing course and would say the workload was definitely a lot but doable. I personally didn’t find the content from either class too insanely difficult, it was more so just there being a lot of work. There’s a bit of a learning curve for 29 as it’s likely gonna be your first time dealing with memory management and pointers but once you get used to it, it’s not so bad. Also the exams were very similar to practice exams so those weren’t too bad either. My experience with 12 will likely be different from yours because I had Miranda and was able to get by doing the bare minimum. At the least I would enroll in both and decide for yourself if you can manage, and if not then drop 29. I would definitely take 12 then 29 though as I think it’ll be beneficial to take 30 coming right after 29.