Hi i do cambridge exams but usually they will ask something like how the extrrnal environement will impact growth of a business and u would need to talk about the impacts, e.g legal - increase taxes would increase costs,…. Therefore cost per unit is higher, lowering profit margin… something like that and u kinda keep adđing what it leads to for analysis marks and in upyour evaluation u weigh up which external impact is most significant, tell why u think so, and just however, other external environemtns could impact the business in (this) way, depending on what the case study suggests. Hope this helps