I would be very surprised in the pass standardised score is 140 in each of 2 tests; that would be very close to the maximum score. It's sounds to me that the Authority or school is something to the equivalent of "if you score full marks in the tests we can guarantee you a place" which is a bit obvious.
The Standardisation scores vary from exam to exam but to give you an indication of some real Standardisation Scores from Real National Tests take a look at the recent 2006 key Stage 2 results. These are available at
If you download and print this out and review you will see that a score of 140 for the Reading, Mental maths and Written Maths is equivalent to a raw score of about 48/50, 20/20, and 79/80 respectively. In fact for Mental Maths 20/20 only gives you a Standardised Score of 134 max as so many scored highly on this section.
The Standardised Score is Statistical distribution which means that the Standardised scores usually always equates to a percentile rank - ie the proportion of candidates achieving that score.
So for example, a score of 117 (a typical 11+ min pass score) is about the 87th percentile. ie 13% of candidates got this score above.
The figure of 140 you quoted is actually above the 99th percentile - ie less than 1% of candidates achieve that score.
For typical NFER exams we were always told that a raw score of about 86% 86/100 is equivalent to about the 117 Min Standardised pass - but please bear in mind that;
(1) this is min pass;
(2) there will be a lot a candidates about the pass level,
(3) The Age may impact this by say + or - 2 marks, and
(4) some LEAs might have a higher pass mark due to competition (say 121).
So to be reasonably confident a child needs to be hitting the 90% raw scores in typical NFER tests. But for harder tests this could be a lot lower - in some Birmingham tests for example, they don't use NFER and the pass marks are historically much lower 65% - 75%
Hope this helps and makes sense.