I think lots of us have issues with various elements of the ole test so, firstly, you are not alone. My boy's marks are quite good, but he makes silly mistakes which then make him either fly into cross denial or be despondent and cue lots of cheering up stuff from me. We all have something
to deal with!!
Added to this there is the general hideous -itis of it all approaching. And yet still not here, a sort of limbo time in which panic can build.
Although you say he is consistently slow at all of it, have you tried timing him doing individual sections? I have recently and it's been very interesting. For instance, he flew through the early sections, the wordy ones, doing each 6 or 7 question block in under 2 minutes and by and large getting them right (except when assumed it was different from rather than similar to, or vice versa, d'oh!). However, come the ones which are 3 codes / 4 words, he was taking about TEN minutes to do half a dozen questions and it was hit and miss whether he was getting it right.
At least it gave ME something to focus on and am sure that I am the major fly in his ointment!
I didn't know about this site when his lucky brother took it so didn't lurch into such a panic (much as I love it here!!
It may well be that some section or other is slowing him down more than others. Plus we're all getting a bit bored of it by now, keeping the impetus going is quite hard, I think.
Good luck, and do report back.