I am more famiiar with the way healthcare.gov works, but in general if you are getting a premium tax credit for health insurance, the amount of the credit is based on the amount of income you say you will be receiving. If you receive more income than that, then you end up having to pay back some of the advance credit you received and it is taken out of your refund or you owe tax due. We do not have enough information from you. You say you will be a student---are you someone else's dependent?
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