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Vocabularly is good on the whole, with important terms used including internal migration and push/pull factors. There are errors in punctuation, such as missing out apostrophes and putting some where they shouldn't be. The sentences can be too short, so more connectives should be used to create longer compound sentences. This isn't a big issue but something I think people should avoid: using the same introduction into every paragraph; notably 'now I am going to talk about...'. In the end the essay is to inform, describe and explain and shouldn't be treated as a casual conversation.