State secondary, starting at 11 - Year 8 seems to be brilliant for DS so far.
They are all settled in, and are set for most subjects. Everyone has a common base on which to build (the pupils come from a large number of primaries) so in subjects such as MFL there is no longer any need to cover material that some children did not cover in primary (DAS had 4 years of quality French teaching in his state primary, others will have had a much smaller amount of teaching from a non-specialist).
The curriculum is still broad, no choices except second MFL having been made, so even for academic DS there is a nice sprinkling of 'hands on' practical subjects that he is unlikely to take for GCSE. Extension for the able seems to be by a mixture of acceleration (early GCSE planned in Music) and by broadening (challenge through some really tricky source work in history).
There is continuous pressure from staff to do well and to try their hardest (and significant knowledge of each pupil in order to detect slacking), but with no high-pressure end point it is about learning much more for its own sake, and academic curiousity is hugely encouraged rather than being greeted by 'we don't have time for that, we have to revse / cover the syllabus / do this exam-style question to check your technique'.
Social groups are established and comfortable, and most pupils have found their niche in the school's extra-curricular activities.
If in a school that prepares for both 11+ and 13+, isn't there a chance that two years get wasted in exam prep / coaching / revision? At least with an 11+ entry point, or conversely a school that only does 13+, only 1 year can possibly be wasted in this way.... (as it happens, DS's sptate primary doesn't 'do' SATs prep in any particular way, so even his Year 6 was absolutely normal with lots of interesting new stuff to learn, with a week of tests followed by lots of extra cross-curtricular stuff in the final half term - but I appreciate that this approach is fairly rare.)