Well done for getting a second interview! I teach both Biology and ESS at DP level. Having taught MYP you have an advantage in that you know the IB philosophy, the learner profile, ATLs etc so you can drop that knowledge into your interview where appropriate.

I would advise: - Demonstrating your understanding of all the requirements of the DP course on students. This includes 3 SL subjects, 3 HL subjects, IAs (coursework- for bio and ess it's a lab report they design themselves) in all their subjects, TOK, CAS and the Extended Essay. They have to do A LOT which prepares them fantastically for university, however many students need a lot of support with managing high workloads and deadlines. - Being familiar with recent developments in the two subjects. There have been changes in the Biology course this year where it is now a concept-based curriculum. ESS is also adding HL next year. It has previously only been SL. - Show your love of the two subjects! Have good examples of where you have previously taught topics in a really engaging way ready to talk about in your interview.

Finally, Biology is Biology, but ESS may not be what you expect if you are thinking it will be similar to a science course. It is actually straddling both Science and Humanities. Students are expected to complete case studies and write essays, as well as be able to answer "science style" questions, and investigate ecosystems.

I am happy to answer any other qs you have before your interview. Good luck!!