The Recruiting Test is 4 part multiple choice, 30 questions in each section & you should aim to get a minimum of 50% correct in each of the 4 sections to be assured of a good pass & to leave viable job options in the Navy, should you not score high enough for your chosen trade. If you score less than ten out of 30 in the English or maths sections, it's an automatic fail for any job. The questions aren't hard, but you need to work fast. If you fail it's 12 months for a re-sit, so beware falling at the first hurdle- for goodness sake -PRACTICE AGAINST THE CLOCK!!!
You get a free practice test booklet from the AFCO, (downlaodable link above) which is an excellent guide to what to expect. Online tests are of limited value as it's a paper & pencil test, however a lot of people say the Brain Training series of games games on a Ninetendo DS helped them.
A very good free online Psychometric Test can be found on the Practice Tests website
BUT: The site is merely used to test out testing systems, so don't put your real ID or email details on the site- just enter spoof data. You should go through the test as fast as you can to simulate the real thing. To my mind itâ€™s probably the most representative of the tests available, albeit online rather than paper & pencil.
Other good online tests can be found at: The Fireman's mechanical comprehension tests will help. (At risk of sounding ageist or sexist, the mechanical aspect tends to be the weakest area for many young males & females). The RN doesn't have any online versions, but the Civil Service online test offers a simulated Naval entry test which isn't strictly reflective, but again gives a good idea of what to expect.
A good book to borrow from a library (harder than the test, but good for practice- IF you feel you need it) is IQ & Psychometric Testing by Phillip Carter another one, believe it or not is the Verbal, Non-Verbal & mathematics sections of 11+ Mixed Papers. It sounds mad but the questions are virtually identical- again it's the timescales that make it difficult. You only have 9 minutes to complete 30 questions in the verbal section, same again in the non-verbal & 16 minutes for the 30 maths questions. Sounds easy- try it!
You don't really need anything more than the booklet the AFCO gives you prior to your RT, it gives you a few examples of the four different type of questions which will appear in the test. Other than having a quick read through this, there isn't a lot more you need to do in the way of revision; the test is far from challenging. However, if you do feel the need to a bit extra there are a few links already around the newbies section which will lead you to sites where you can take a few practice tests.