So I would recommend trying different versions of 'best' practice...
Hi Mystery, I just meant by this that it can be good to try out a variety of different types of approaches to tackling multiple choice comprehensions to see what works best for your child and the style/time pressure of the particular type of comprehension test your child is sitting.
I'm not sure I'm best to advise on actual publishers as we didn't do a huge amount of practise in the end (which worried me hugely before the exam!).
I did sneak some comprehension practise into bedtimes when I read to my DS... poor boy! I couldn't get away with much of it. We just did a few shorter type multiple choice comprehensions over the summer and I tried to vary the publisher so he would be more resilient. I think we used a few from the CGP CEM style verbal and comprehension book, I gave him the Lancashire school practice comprehension that was linked to elsewhere (they seemed closer to inference type questions), and the Bexley CEM practice test.
If we had spent more time on it earlier in the year I would have tried picking out the comprehension bits from Tutor Masters Comprehension Practice Multiple Choice set 1 and Bond 11+ English test papers - the multiple choice version. I have seen parents recommend that non-multiple choice practice is also useful to build skills but my DS is dyslexic and finds the bigger amount of writing involved very tedious so we avoided those. He's not going to love SATs practice this year!
(Edited to correct those sneaky typos!)