Exam clashes??

So I don't really know much about this 😔. I'm planning to give chemistry composite on this Oct Nov session and there appears to be a clash between p22 and p52. What can I do about it like who do I reach out to and what do I need to?? Also I haven't covered as level organic like I have never even opened those chapters, is it in any way unrealistic of me to hope to complete that and A2 syllabus alongside past papers in under 100 days since the first exam is on 29 sep. I'm giving variant 2