It is strongly recommended that you review these 10 points to remember when applying for a student visa in advance of your interview, so that you know what you will be asked about (Please note that access to the link above requires the creation of a free account).

What to bring to your visa interview

Please review the list below and make sure you have these items with you when you go to your visa interview appointment. Keep in mind that the consulate/embassy may require additional documents beyond what is listed below, so it is strongly recommended that you review the instructions for how to apply for a visa on the specific website of the consulate or embassy you have scheduled your interview at. It is your responsibility to make sure you bring the necessary documentation to your visa interview. This will include (but again, may not be limited to, so check with your local consulate):

Your passport, valid for at least 6 months after the program start date listed on your Form I-20 or Form DS-2019, and with available empty pages.
Your hard copy Form I-20 or Form DS-2019. Please make sure you have signed it!
Confirmation page (with barcode) showing that you have completed the Form DS-160, Online Nonimmigrant Visa Electronic Application.
Proof of Payment of the SEVIS I-901 Fee. This fee is required of all student visa applicants.
Documentation proving your financial ability to meet the estimated expenses for your program. You should bring the same documentation you submitted in iTorero, as long as it is within 3 months old.
Evidence of your English proficiency (for example, a copy of your official TOEFL or IELTS scores).
Proof of your academic preparation/credentials, such as copies of transcripts, diplomas, and any standardized test scores.
Proof of payment of the Visa Reciprocity Fee, if applicable. This fee is not required in all cases, so please review the link to see if it will be applied in your case.