1, exam result are posted on web site,usually do better than the boys school and forest,my daughter is now in yr 8- her homework schedule is pretty full on, as at least 2/3 pieces each night- school works with time management, they have emailed us a homework timetable so parents are fully aware of what dhtrs should be doing. They do push the students hard.
Re activities, school is very encouraging and activitly promotes extra curricular activities during lunch hr & after school- activities include netball, badminton,cross country,choir, jnr band orchestra, chess, dance, fashion, cooking, nail art, martial arts,film,just to name a few.
Re mass exodus, I don't know,there may have been but has no bearing on dhtrs performance, teachers we have experience of have been there a while and seem to really care, I know of only one teacher that has left.
2, regarding new build, yes a massive amount of money will be invested in the school- hence the increased intake, new build will be on existing site, yes the school does need this, it's all about funding in state schools,hence if yr dhtr does attend the school it's really important to join the Pta to help raise funds. Trust me the school may be a bit shabby & the science labs might be old,but ultimately it's the people that make the school.
2 years ago we were in the same position as yrself, we decided to opt for local school inorder to enhance the social aspect of school life.she can fully participate in all of school life including after school clubs/activities, she has good friends which she can socialise with after school and coming form the locality she also has a strong sense of community spirit. Having been through this before and will be going through this again with my son next year,my priorities are completely different- remember it's not all the nuts and bolts ie previous academic results,the facilities etc, but also depends on so many other factors- choose the school that is right for your child,as a happy child in the right enviroment will always flourish.
Hope this helps !! Good luck