What forms do I need for my visa extension application in Thailand?

The user is preparing for a visa extension application and inquires about necessary documents to bring along. Key documents mentioned include the TM7 form, a copy of the passport, TM30, and cash for payment. Comments from the community indicate potential additional requirements such as two recent passport photos, a bank statement, and the necessity to present the original passport instead of copies. Users also note that the immigration office to visit should correspond to where the TM30 is filed.