So I didn't get the grades I wanted so I went to a university I didn't really wanted to go to, I'm currently doing a foundation year, I would like to transfer to another university next year, how would I do so ? Do I apply through clearing or what ?
If you want to move elsewhere then apply through ucas ASAP. Universities aren’t likely to have time in clearing to properly assess whether your current foundation year is suitable preparation for their degrees. Ideally you would have applied before the January deadline but with that missed you should apply asap to maximise your chances.