TFWS means Tution Fee Waiver Scheme.

No, you are not allowed to change the college if you have already taken the admission in a particular college, you need to once again appear for the entrance exam and clear it out to get a new college starting from the first year till then you need to move on with the same college.

Also if you want to change the college you can change in the second year in the same university,you can, but you will no more be a tfws student