You are well qualified, and good physics teachers are in very short supply, so I would advise you to apply wherever you see a position you are interested in, even if they stipulate IB or A-Level experience. The fact that you don't have IB Diploma or A-level experience might count against you if there are other candidates with more relevant experience, but in reality, IB Diploma, A-level and IP are at similar levels, with slightly different emphases. If you can teach one, you can teach them all, and a good school will provide you with appropriate professional development. A "true" International School (one committed to diversity and intercultural understanding) would welcome a bilingual teacher at this level, so don't worry about not being a native speaker of English. A good international school will enroll students from a variety of nationalities and mother tongues, and support high levels of fluency in English, with additional programs to support English learners. English will be the common language of the school. If you are concerned about your students' level of English you might want to avoid schools which are actually national schools in non-English speaking locations enrolling local students but following an international curriculum. As to work load, I don't think one curriculum is more demanding than another - it comes down to how many contact periods the school gives its teachers, and average class size. I know the IB Diploma best, and it does come with a lot of formative and summative assessment requirements, so you need to plan your year carefully, but it's not that difficult. Good luck!