@Wxluuu we are not taking the exams this year( ds is in year 1) but starting to prepare.
I have read this thread from 2021 which I put the link below and you can find lots of thoughts exchanging after taking exams ( dealing with stress, how assessments go, when they post the result, what is parents assessment about,...). Hope that gives you some peace( I remember more or less most of candidates in that thread couldnt finish their papers in different parts but they all got offer for their desired schools at the end). All the best to your DS.
www.mumsnet.com/talk/primary/4359811-7-exam?page=1