I believe SBL was originally intended to be an end of studies exam. It also contains a lot of the models from APM.
SBR, as a word of warning, assumes you know fully all knowledge from FR and FA (which if you’ve got exemptions might be rusty). I had to go back and watch all FR and FA lectures before I could start SBR as I also had exemptions.
Personally I would take SBR in Sep (Plenty of time to refresh on FR and FA if needed), AAA in Dec (If you have already done AA), APM March and finish with SBL June.