You must file your request for an extension of status prior to the expiration of your current status. It is best to make sure the request to extend status is received by USCIS prior to the expiration of your current authorized stay. You should also document the request with evidence of the need for the extension and your intent to return to your native country.
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The application requesting extension of your status can be filed no later than the I-94 expiration date. You need a valid reason for extension (and studying is not one such reason), intention to depart the U.S., adequate funds or staying in c/o someone to finance your extension, evidence of a foreign residence abroad which you have no intention of abandoning, etc. Discuss case specific issues with your current immigration attorney.
The information contained in this answer is provided for informational purposes only, and should not be construed as legal advice on any subject matter, nor should it be viewed as establishing an attorney client relationship of any kind.
You need to file extension ahead of time before your visa date is passed. I encourage you to see an attorney to file for extension. Good luck
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