Is St. Mary's Cambridge a good school?

This school i am considering to apply to 6th form is St. Mary's School, Cambridge, UK
I tried to do some research online but there was nothing much about it. So here are a couple of questions I have been thinking about:
1. I heard the school campus is quite small, is it true?
2. Is the school comparatively more traditional and strict?
3. Is the teacher-student relationship close?
4. Are there any joint-school activities?
5. Besides of the 4 subjects I choose to study for A-levels, are there any other compulsory enrichment lessons such as physical education, music, religious studies etc.?
6. Any other things about this school I have to bear in mind?
Not all of the questions have to be answered, but more information will be greatly appreciated! Thanks a lot x