Voor wie zou twijfelen of het een goed idee is, check wat je kan lezen in de EEF toolkit:

On average, evidence suggests that pupils who attend a summer school make approximately two additional months’ progress compared to similar pupils who do not.
Greater impacts (as much as four additional months’ progress) can be achieved when summer schools are intensive, well-resourced, and involve small group tuition by trained and experienced teachers. In contrast, summer schools without a clear academic component are not usually associated with learning gains. Other variables, such as whether the teacher is one of the student’s usual teachers, seem to make less difference on average.

De grootste uitdaging blijkt… deelname:

A recent evaluation for the Department for Education in the UK concluded that one of the greatest barriers to summer schools having impact was achieving high levels of attendance.

Hier zal zoals Kris aangeeft misschien wel het meeste werk van gemaakt moeten worden…