Yes, lots of practice for NVR. It's quite easy to rush through the questions and make silly mistakes though, so watch out for that happening. DD has a habit of doing this.
How far into the prep are you? Some advice posted by FM last year which might be helpful
I would start with the Bond assessment papers for familiarisation. Do one type at a time i.e. all series, then all matrices etc.. Encourage elimination rather than selection i.e. crossing out wrong answers rather than selecting right ones. Most questions will have one answer that is spot-on and one that is nearly right, and, if you go for selection rather than elimination, child is likely to pick the first he encounters that seems to fit the bill which will mean he only gets half right.
After Bond, assuming all is going well, you could do AFN papers (easiest), followed by Bond Test Papers (hardest), followed finally by NFER (remembering Test A is the trickiest) and you may wish to do that one with him so you don't both become despondent with possible low score.
I would keep NFER papers until last. Bond is good to do with him as it is harder but includes all the combinations he will meet in the Bond papers. The important thing is to use the earlier papers to teach rather than test.