The traditional European education systems are brutally exclusive. Students (except children of the rich) are not allowed to progress unless they can perform at the necessary level.
This puts pressure on students.
The US education system (and the English one for the past 30 years) is inclusive. Very little expense or effort is spared to have every student reach their 'full potential'.
This puts pressure on the teachers and the rest of the system.
The US and English systems should be producing a better 'yield' of the STEM (Science, technology, engineering and mathematics) people that we need, yet they are not.
A possible reason is above.