Congratulations Explorer and BLT, the cut off marks will vary depending on the distribution curve of all the scores. The NFER website explains the 'bell curve' of distribution really well. If the distribution is normal then a score of 338 should be in the top 120, Explorer.
There are other factors involved too, for example once the scores go to the local authority, and they apply the over subscription rules, the list could move a little eg, looked after children are given priority, and some boys may have applied for more than one school, so they may not apply to Bournemouth if they prefer their other school.
Helpful? Thank goodness it's all over, my DS is relieved we now know how he did.