I started SN2 but felt it didn't work for me. Switching back and forth between the books made it confusing for someone disorganized like I am. SN2's schedule was really hard when you're volunteering and working. The days never matched up for me. I rather work through each subject/book at a time, compile my note cards and move on. It's working great so far.
OP, definitely do the passages at the end of each chapter review to make sure you grasp the big picture/concepts. I may skip over a few if I felt it was just repeating a concept that I've already grasp. The skipped passages gave me some wiggle room for extra practice if I mistakenly thought I had something down.