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We also bought a bond ten minute math test book and a pack of NVR multiple choice practice papers. Over the summer holidays we did half an hour each day on one thing. In addition carried on with reading to himself and me reading to him every night which we have done always. DS qualified with an exceptional score and we were mightily relieved!
My advice is to read widely, talk, encourage your child to ask if they don't know a word, don't start anything "formal" too early. The NVR practice papers were well worth doing as this was something quite alien to him.
The test is very time pressured, even with his high score my ds did not finish every section and they don't need to finish it all to do well.
Be sure your child is able to cope with the level of work expected - talk to their teacher if you are in doubt. Its a shame to put a child through that unless they have a realistic chance of success.
Best of luck
you will need nerves of steel and a steady supply of cake and wine.....