Quick Definition
A visa extension prolongs the validity of an existing student visa when studies take longer than originally planned or when continuing to postgraduate level. In the UK, apply for a new Student visa (not an 'extension') via gov.uk. In the USA, the I-20 is extended by the DSO — no USCIS action needed for D/S status.
Visa Extension — Full Explanation
USA: DSO extends the I-20 program end date — no separate USCIS application for F-1 D/S status. UK: apply for a new Student visa before your current one expires. Australia: apply for a new Subclass 500 or 485. Canada: extend your Study Permit at least 30 days before expiry.
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