You should start planning at least 2 months before your current visa expires and always before your course end date. Please do not request your CAS if you are expecting module results, as the results may affect the end date of your course.
Please note that you will not be issued a CAS for a placement unless you have secured a placement, and that you will need to submit your visa application prior to starting the placement.
The University will not issue a CAS to cover your resit period, or to await your results. Refer to our Resits and your Student visa webpage for more information.