Please first check our "CAS for extending your visa" webpage to determine whether you will be eligible for a new CAS to extend your student visa, as there are a number of factors that we must take into account.
If you need to extend your student visa to complete your studies and believe you meet the eligibility criteria, you must first complete the CAS request form and send it to studentvisa@gre.ac.uk. The Visa Compliance Team will then assess whether you can be granted the CAS and will respond to you within 10 working days.
For more information, please visit our "Extending your Student Visa" webpage.