Upvote:2
No, it is not possible to switch from Tier 5 to Tier 4. From the UK government's webpage on the subject:
You may be able to change (switch) to a Tier 4 (General) student visa if youβre in the UK under any of the following visas or schemes:
- Tier 2 (General)
- Tier 2 (Intra-company transfer)
- Tier 2 (Minister of religion)
- Tier 4 (Child)
Since this won't apply to you, you can't switch to Tier 4.
It's also not possible to extend a Tier 5 (Youth mobility) visa. Therefore, you will need to leave the UK in order to apply for a Tier 4 visa when your Tier 5 visa expires.