I am one of the students from Bellerbys and I think you should go to the other colleges instead especially if you are doing A-Level. To get a good grade, you have to be lucky since the quality of the teachers is very inconsistent. I have been studying in this college for more than 2 years. I did the one-year IGCSE course in the first year, it was not bad. However, the A-Level is another story. Their A-Level course is basically a scam as you barely get any support from the teachers. I did three subjects, including Maths, Economics and Accounting, 2 out of 3 teachers were really bad at teaching. All the good teachers are reserved for the "better" students.
As for the residence and welfare, we are treated like dogs. I would avoid commenting on the quality of the food since it is subjective but the hygiene is below average. The wi-fi is slow and they banned googling some controversial terms that might be needed for the research.
Also, do not trust the marketing team. The Ukranian girl in the video is a sellout.