Hi Danny, This is the P1 specific forum, it might be worth having a chat with other students in the student CIMA forum.
I can say that any / all of the topics from E1/ P1 and F1 are examinable at Op.case-study.
I would advise you pay particular attention to
Budgeting/ Forecasting Risk Chapters Costing breakeven/ linear programming
More indications can be found by looking at the CIMA 2019 Blueprints “I Can” statements for case-study – they show exactly what can be examined and the weighting you can expect for each syllabus section