Hi,
60 days after you receive letter from the home office.if you do not after 90 days you have to make a fresh application.if your backup is older than 3 months.
Glad to help out.

Since your college is no more on the list you need to apply for a new visa application even when you have visa till the next year.You have a limit of 3 months to do that.
For more questions email me.
Thanks

Well you are not the only one who is facing this problem.Several other students try to extend visas on lower level than before which usually leads to refusal.The best thing you can do is to get admission in the same level with a new application .Email me for more questiojns. Can help out.

ok