Just noticed your post and thought i would share my recommendations with you.
My son is yr 6 now and sat the 11+ he qualified but is on the waiting list due to over-subscription. This is sooooo very disappointing as you can imagine. We are still in the process of appeal but to be honest we are resigned to the fact he will go to his second choice school in september.
My advice to you would be this:
Most definately get yourself child some tutoring as places are soo competitive, although i understand the test is changing this year so verbal reasoning is now not on the agenda!! I have never understood why they test them on things they dont learn at school.
The school will NOT tell you how he scored or where he was ranked, you just get a yes or no answer and phoning them makes no difference, they will not disclose any information.
Definately book a place for the mock exam as this is a great exercise to prepare them for the whole exam situation and you do get proper results that will show where he is ranked but bear in mind not all boys sit the mock.
Be prepared if he should not make it as it is bitterly disappointing for you and him, the whole process is so much pressure for an 11 year old.
we used a tutor but for just 4 weeks and cant recommend her enough so if you would like her details let me know and i will pass them on, she is based in Hartley and teaches a small group of say 5 boys at a time.
This really is one of the most difficult decisions to make on behalf of your precious one and i wish you all the luck.