The following changes regarding Tier 4 General were announced on 13th July 2015, which is to be implemented on 12th November 2015.
ban college students from extending their Tier 4 visas in the UK unless they are studying at an ‘embedded college’, one which has a formal, direct link to a university that is recognised by the Home Office. This will require them to leave and apply for a new visa from outside the UK if they wish to study another course
ban college students from being able to switch visas to Tiers 2 or 5 in the UK, and require them to apply from outside the UK
reduce the time limit for study at further education level from 3 years to 2 years. This brings the maximum period into line with the length of time British students generally spend in further education
For more information, please visit: https://www.gov.uk/government/news/tier-4-visas-immigration-rules-changes