Is the A2 coursework hard to organise if you are a big centre?

No more so than the coursework option of any other specification.

There isn't a written test or exam alternative to the A2 coursework element, and each student should complete a whole investigation themselves.

Every student in each teaching group completes a unique investigation so that there is no collaboration during the investigation. It is possible for students to do similar investigations if they are in different teaching groups.

A centre with 200+ students doesn't need 200 unique investigations! The investigation is only 10% and needs to be kept in proportion.

Some centres carry out A2 coursework on their field trip. Large centres may find this makes it difficult to find enough different investigations.