FR before SBR

I would appreciate your advice regarding preparation for the SBR exam. As I have begun studying, I realised that I have forgotten quite a few concepts from Financial Reporting. Since SBR builds on FR, this has made me depressed about how to structure my study plan effectively.
Could you please advise on the best approach?
Should I revisit the FR theory in detail before starting SBR? Or is SBR theory would be enough?

Thank you in advance for your guidance. I truly appreciate your support.