K204 is all about Microsoft Excel and Access, so I guess the best way would be to watch some videos online about how to use Excel and Access, or take a class on them or something like that. I don’t think it’s necessary to study in advance though unless you struggle with computers. You could switch Micro with W131 if you want. It really doesn’t matter what order you take the classes in as long as you get them done. I guess it might be a good idea to avoid taking W131 and C106 at the same time since they both require a decent amount of work. It’s up to you though