There are three different batteries of tests there, and to some extent, your DS just "warmed up" as things went along!
His verbal skills are clearly first-rate: 141 in a CAT test is the maximum, and his reading age is probably at the maximum for that test battery.
His quantitative CAT score is rather weaker, at 115, although still well above the national average of 100.
The spatial score of 113 is similar, although I've rarely seen a child with a decent spatial score since they were introduced. The moral of the story there is "Do not set him loose in open countryside with a map!" Otherwise I am not convinced about the value of the spatial score in assessing anything very much academically. (Disagreements on a postcard, please.

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The mean CAT score without the spatial score is therefore almost 130, and that is very much within the zone for success in the 11+, whether it be in a non-super-selective area such as Kent, or in more competitive areas.
You should focus on improving maths, because that will be the weakest link.