The archive of this old forum contains a lot of info on this, among other topics. Using the keyword search often brings up a few irrelevant conversations to weed though, but the info in this archive is immense. Try doing a search for - SCWI Exam Prep. This is a good place to start.
There is a note there that as of current status, AWS does not provide any live or online classes for SCWI. BUT, it does provide a list of recommended study references for your use.
If you go to other organizations websites I believe you will find a couple that do provide classes for achieving SCWI standing.