We know someone who went there about five years ago after moving to England and needing to do GCSEs in a year. He was a bright boy and worked very hard and achieved really excellent results. The parents had nothing but good to say about the College, especiallly the efforts staff made, within obvious constraints, to provide a broader school experience.
I suspect a lot will depend on the student and their own motivation. The support will be available for a good student who knows where they are going and are prepared to work to get the results. A college environment may not be the best for a student who perhaps has struggled to make the effort required in a previous school.