Sixth Form - A level Business with no GCSE

Hi, I want to take A Level Business but have not done it for GCSE.
After my GCSEs are over, I plan to catch up on Business. WJEC board has plenty of Blended Learning modules and Knowledge Organiser sheets on their website for both GCSE and AS / A level Business topics.
Would it be advisable for me to catch up on the whole GCSE syllabus? Or am I better off just working on the AS Level modules ahead of class?
For GCSE Business:
https://resource.download.wjec.co.uk/vtc/2022-23/el22-23_22-1/pdf/_eng/gcse-business-student-revision-plan.pdf
For AS/A Level Business:
https://resource.download.wjec.co.uk/vtc/2022-23/el22-23_22-5/pdf/eng/alevel-business-student-revision-plan-eng.pdf

Hi, I’m in my second year of sixth-form. I took A-Level business without studying GCSE business as my school did not offer it. I wasn’t at a disadvantage as the majority of the people in my class had not studied business at GCSE and since my college follows the Eduqas specification (which I have heard is similar to WJEC), we learnt all of the key concepts from scratch, meaning that everyone was at the same level as each other and we all gained a good understanding of the key topics.
Hope this helps!