I agree with tiredmum you need to consider very carefully if a review is the best way forward. Make sure you fully understand how a review works before making a decision.
If you have strong support from school and an excellent portfolio of work with no mitigating circumstances then a review may be a good option. If you want to be able to present other non-school information or mitigating circumstances then an appeal may be a better option.
It is a very difficult choice parents have to make in Medway.http://www.elevenplusexams.co.uk/11plus ... nswers.php
Be warned that the scope of a LA review might be strictly limited. In Medway, for example, “Your child’s primary school will be asked to provide work in maths, science and English and this will be reviewed by a panel. Supplementary material supplied by parents or other agencies will not be admissible.” Unless you are confident of succeeding on this basis, and have the support of your current headteacher, it would be safer to opt for an appeal (without a review) where you are allowed to put forward other academic evidence or extenuating circumstances.