Most In-Demand Subjects?

I’m currently not credentialed and teaching in a small, private English-language school in China. I’ve decided to get a teaching credential so I can work in ‘real’ international schools. I’m trying to decide in which subject to become credentialed.

My question is:  What are the most in-demand subjects in international schools? If it’s math or science, which specific types, i.e. Calculus, Physics, Chemistry, Statistics?

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