If you scored high enough for WS and Sea Spec, by not ET, then it`s safe to assume you need to increase your maths score by about 50%.
In addition it`s feasible to score zero in Mechanical Comprehension or Reasoning and still pass for non technical trades whereas the ET specializations require at least 50% correct in those sections.
When it comes to revising for a result, beware thinking "I was only a couple of points short in specific sections" and only revising those those bits - odds are the all-out score could need improving by 30-40%
Good luck - preparation is the key.
I was thinking down the route of WE or ME does That principle still count even though its not ET
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