There are 5 free maths papers on the *** Advertising Censored *** website too. Feel free to pm me if you don't know where to look.
We did those but I'm not sure those papers would be very good with only 5 weeks to go as they are very easy - more SATS level I think.
The 'problem' questions on some of the private schools pages are very good & then the actual paper should be a doddle after them - not that they are too hard, but make them think & work within tighter time limits.
Also try the primary maths challenge past papers on http://m-a.org.uk/jsp/index.jsp?lnk=251
I think these are more the level to work at.
And remind DC to read the Q's. My DS always gets the easy ones wrong as he skips throughm the question & skims over a relevant word