If you read all 3 books (SYS/FOM/CFM) cover to cover before you show up to class, and pay attention, the ground portion is done. It won't matter if it's closed or open book, you will know what you need to and won't need to crack the cover. The sim portion is some more time studying with the CFM and listening to what the instructor has to say if you happen to be doing something a little differently than how the CFM wants it done. Whether you are upgrading into a -200 from a -900 or -200 to -200, this isn't rocket science if you just take some time to prep before arrival and give it your full attention in class or the sim. If you have a question in a lesson, ask. If you are doing something incorrect, it will be brought forth with the CFM as the basis of correction. It's a 2 way communicative street; a positive attitude and a little prep beforehand is a currency of gold.