What's available is listed here.
https://azure.microsoft.com/en-us/free/students/
you can check your balance here.
https://www.microsoftazuresponsorships.com/
If you’re still a student, you may renew for another 100 USD Azure credit. They’ll send a notification when you’re eligible for renewal (up to 30 days before your anniversary of signing up). Simply re-validate your student account with them and you’ll be given additional Azure credit. Unused credit is non-transferable.
https://azure.microsoft.com/en-us/free/free-account-students-faq/
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