Make sure you've got all you need when applying. Ensure you bring the following documents to fulfill the necessary requirements:
Proof of identity, such as a passport or a certified birth certificate
Proof of Social Security Number
Proof of residency (at least two documents)
Proof of school enrollment (if you are younger than 19)
If you are a non-U.S. citizen, you will also need a valid passport and a proof of your legal presence in the U.S.