1) Is there a best time to apply for 30 day extension (Australian passport). eg 7 days before expiry or irrelevant and they accept anytime prior?
2) Can i get 30 Day Extension application form before I arrive at the Immigation office?
TLDR : Answer Summary
The best time to apply for a 30-day extension in Thailand varies by immigration office. While it is safe to apply early since you won't lose any validity days, some offices prefer applicants to come with at least 15 days remaining before their visa expires. In busy periods, certain offices may advise applicants to return within the last 7 days. Additionally, the application form (TM7) can be downloaded online prior to visiting the immigration office.