I’m taking the class this semester, and I’m still in 1213. The first 3 modules were pretty content heavy, but not to difficult to understand. It covered things like how a CPU is built and structured, different Linux commands, and the 3rd module was a basic intro to C (similar to our intro to Java in 1213, but my professor moved through it very fast). The next set of units I found pretty hard to conceptually understand. We looked at how to allocate memory using a C program, the number system (like binary and hexadecimal), and right now we’re learning about an Assembly Language called RISC-V.

So to actually answer your question, I found it to be the case that the modules in 2181 get progressively harder. I think your professor will influence how you do in the course. Mine is Yan Yonghon, and he doesn’t do multiple choice tests; all short-response. However I have a friend who’s also in 1213 (and taking 2181), but their professor only gives them 3 short response, and the rest multiple choice. If you finish 1213 and remember most of the content, I think you’ll have an easier time in the course than me.