@Sugar118 If you are in London, you might want to consider that including in your list schools out of London gives you not only additional options but also schools where the relation between academic performance vs difficulty of entry is different. London is a bit of a different 'market' and a more competitive one. Of course, it depends on willingness to travel and access to means of transport, but you could consider adding to your list of potential schools to visit schools like Caterham, Dunottar, Woldingham to your list. St Theresa's in Effingham or Priors Fields could also e options. Or Notre Dame in Cobham.
In SW London, both SCHS and Sutton High tend to be overlooked in the shadow of WHS and PHS but both strong on pastoral and getting increasingly good results.
As a general advice, I think that most people nowadays apply to 4-7 exams (sometimes same exam can be used for different schools - for instance, we had 3 schools with ISEB and I know that other people did the same with Consortium). And people have 1 or 2 'safer options' - I hesitate to use the expression 'fallback' as I think that nothing is safe nowadays and also it needs to be a school that you like enough so as to think that, if that was the only offer, you would want your DD to go there.