Can I stop going to school and still apply for the green card if I’m an F1 student?

When a foreign national who entered the U.S. lawfully and with inspection (such as with a student visa) becomes married to a U.S. citizen, the couple may succeed in a marriage-based adjustment of status application process even if the foreign national spouse has stopped going to school and no longer is in valid F-1 nonimmigrant status. If the U.S. citizen now has documentable evidence of an income sufficient to meet the Affidavit of Support requirements, it will be unnecessary to have a joint sponsor. If the U.S. citizen does not now have sufficient documentable income, then a joint sponsor indeed will be needed. It would be wise for you and your husband to consult with an immigration attorney who, after learning all of the relevant information, could advise about eligibilities, options, and strategies to attain your goals, and who then could offer legal representation in the often complex application process. Some immigration law firms, including mine, offer legal services on a "flat fee" basis so that a client will know the total expense from the very beginning, and a few immigration law firms, including mine, offer an initial consultation free of charge.