DS would not be appearing for 11+ as we are not in UK, but few past papers made me that doing it just for sake of knowledge would benefit him. So far, I have liked English paper mostly, haven't touch others yet. I could download 30-40 past papers from various resources and I am very keen to do Bonds papers as well but those are costly in country I live as those are ordered overseas and mere size of those books are too much for me to invest as idea here is to just increase knowledge( no 11+ exams). I am looking for suggestion on cheap options to get same benefit, Can somebody please suggest what all books are really worth. I am looking for advance material. DS is almost 10.