I am helping my daughter prepare at home at the moment, we are doing about 1/2 an hour each morning, little 15 minute VR tests that I bought off this website, looking at weaker areas in maths, and encouraging her to read something every day. We had a tutor until the end of term, her advice for summer was not to push them too hard, and to read as much as possible. My daughter needs to speed up if anything, but I'm not going to pressure her too much.
I work in a high school where boys have not passed the 11+ and last October 2 ex students went on to study medicine. It's not the end of it all if they dont pass, I keep reminding myself! Good Luck.
thats just what we are doing almost mirror image (apart from the tutor)...but we are having loads of summer fun also