Has anyone heard of this?

my sister will be entering y7 in sep and she just about meets the average marks needed at her level. im worried she will be behind and the stress of the new school will affect her more. ive seen this summer school from 'myedspace' and they said it is for ks3 students (https://learn.myedspace.co.uk/summer-school/ks3) but ive never heard of it before. has anyone heard of them? it also says the the first course is free but im not sure if its too good to be true and if it will be worth it. thanks in advanced