Hi, my son is starting to get ready for the 8+ exams of SPJ, KCS and WU. I will support him during this. Could anyone who has experience please share which books or materials would be the best for this? Schofield books? Bond books (which I heard are too easy), CGP books? or EPP papers? (which are quite expensive - are they worth it?) And what year / age should he be doing comfortably? Has anyone also used Atom Learning? Do you have any other suggestions? Thank you so much!