Firstly, some practical help
The Tutors have provided a free Verbal Reasoning Methods & Technique Course that explains all 21 question types used in the Bucks test and refers to free question sets that are contained on there Verbal Reasoning CD1.
Unfortunately, Elevenplusexams.co.uk have not provided a direct link to it on their front page, so you will need to "find it", so here is the link.
http://www.elevenplusexams.co.uk/pdf/th ... hnique.pdf
Not to evade your question about whether the Bucks tests is effective.
The Bucks test is effective in selecting children for Grammar school places based on two Verbal Reasoning tests with the highest test being counted.
Some would argue that it is an effective test in selecting the brightest children for Grammar school places.
A few problems with the Bucks test is it is by far the easiest formatted test for 11+ in the country, therefore the pass mark is extraordinary high. As the majority of the question types in the test are non-curricular parents generally need to provide a source of tutoring whether through a tutor or through DIY. So do not take too much notice of the Secondary Admissions Guide.
I think that 10 pounds per student per hour is a low price for tuition. As the tests are getting closer use the course and this forum for support. You will receive plenty of free help.