girlmeetsvce yeah i did it n got relatively high (2023 student), basically best advice is to SCRUTINISE that rubric and ensure you are doing everything your school wants u to do in order to get a high mark, its possible to score quite highly for this
additionally look at all research papers you can and summarise them and store them so you have a rough idea, don't pick something super niche like i did and struggle to find research papers, make sure they're free too because sometimes it's paid but that's hidden cleverly 💀💀
once you pick your topic make sure you understand the theory really well and are able to stick to word limit for the different sections of your poster
good luck !!!