If you have level 2 there for your younger student, you can look through the textbook and see whether there are important concepts in 2A, or whether you want to start in 2B, which might be fine if he passed that placement test, too.
I agree with Heather that there may be some areas you can skip through. When I started my son in Singapore (after public school), I skipped over a few of the early lessons on topics like money because he needed no help with that. Then in other areas I just taught the lesson, emphasizing the "Singapore way of thinking about it," and skipped the workbook if he seemed to get it already. Those adjustments are easy in level 2 and somewhat in level 3. I wouldn't recommend skipping anything once you get to level 4 and above, but you could go a little faster at times, as Heather mentioned.Mom2theteam wrote:You can skip or minimally cover the sections he already knows and hit the portions that are heavy on mental math and the couple other things he was weak on. Just keep in mind that MFW recommends finishing 5B by the end of 6th grade. With that in mind, he will need to go a little faster through to get there.
Don't forget math facts drill, as well