Can I extend my exempt visa stay in Thailand before it expires?

The user seeks advice on extending their exempt visa entry, which is currently valid until April 2, by an additional 30 days. They inquire whether it is possible to apply for the extension immediately or if they need to wait until closer to the expiration date. According to a comment, they can apply for the extension at Immigration without leaving Thailand, though some offices may recommend waiting until 7-10 days before the visa expires. The extension process requires a fee and additional documentation.