It’s a brand new school (not converted from anything) so there aren’t any GCSE results.
If you looked up Harris in general, then they have loads of schools across the country. Some of them would have been dire, failing schools that Harris took over so they can be pretty bad anyway. That won’t mean anything for this particular school, though.
If you want a school that has been around for a long time with an excellent track record, then look at Cheam High, Glenthorne or Greenshaw.
However, even if you go with somewhere average like Overton Grange or Carshalton Girls, they also do have top sets and many students getting pretty much straight 9-7 (A*-A) at GCSE.
The only bad school at the moment is Stanley Park which was run into the ground by the previous head/SLT. Their results literally dropped off a cliff in the last few years. Luckily, there’s a new head with an excellent track record so thI school should be up to scratch again in the next few years.
One thing I would say (having done bits of work in all but 2 of Sutton grammars + 100+ secondaries across London) is that none of the Sutton schools are rough and the behaviour is amazing even in the schools at the bottom of he league table.
Obviously bullying can happen anywhere and it’s all about how schools deal with it.