I have a ds2 in year 3, he loves maths but never reads, did quite well in his Sats ks1, but I'm surprised to hear you're considering a tutor so early.
I've never had any test results other than Sats. I'm not sure what an NFER test even is.
grgygirl, your ds is doing well - 3A and 3C sound really good for early in year 3.
I'm not sure my ds2 should do extra work now, he's still settling into junior school, and tired from all the extra curricular activities. But they're all different. We have a parents consultation in Nov., I suppose I will find out how my ds2 is doing then. I just think year 3 is a bit early to have a tutor. But that's just my son, and I'm definitely not thinking about the 11+ for years. I'm still recovering from last year.