What else certificate I must arrange for ESL to work in UAE?

I have compleated my master's degree in Microbiology with Biochemistry. My language of study was English. I think I am good in English. My knowledge is better in teaching chemistry for IGCSE and A-Level. I suspect if I get disqualified because of ESL certificate. If possible please guide me, how to get ESL certificate to teach in Qatar or UAE?

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