So essentially a one size fits all is not compatible with the wide diversity of pupils.
As much as many in education attempt with some ambition to raise the overall level especially as schools are as more ranked and rated by their success of overall educational grades attainment than other less measurable metrics including general pupil social and personal development.
The smarter alternative would be to cater for those more able and more suited to further challenge deeper greater learning so that these higher capability pupils are not held back, bored or suffer unfulfilled potential.
Those less able at the other end will likewise require extra tutoring to accommodate at their pace of learning.
The majority of the class would be in the medium cohort and achieve expected academic standards.
All pupils are different and not robots and so this must be accommodated appropriately to realise the potential of each pupil. Some will be more capable and academic, others more suited to develop their other talents be it artistic or sporting or practical as in applying their ability to learn a trade and manual skills which other pupils are not as well suited.
However as there are particular schools to accommodate pupils with specific needs there needs acknowledgment that there should be schools to cater for all three general abilities as well as these specific needs schools where these pupils will be better safeguarded with specific specialist teachers trained to have specific skills as required and bring out the potential of these pupils too.
Should pupils progress above and beyond the likely expectation - the system should be flexible to accommodate movement between these categories of schools. Indeed conversely if a pupil initially recognised as advanced struggles in due course - this pupil will again be better served in an alternative more suited school for that level of educational attainment.
This above would be a modern more flexible version of selective grammar schools, comprehensive academies and specific needs schools.
This is a reflection of further advance studies at university with some better suited to higher attainment students and not so much elitist but reality and a reflection of diversity. You cannot expect all pupils to be identical nor want to study the same subjects nor do as well academically.