Thank you for your question! UKCAT preparation takes around six weeks, and he will be able to sit the test between July and the beginning of October 2018 – so depending on when he books the exam, he’ll start preparing at some time between these months. You’ll be able to find additional info about the UKCAT here: https://www.themedicportal.com/application-guide/ukcat/
Regarding the UKCAT book, we’re working on a new edition which should be published this year – keep an eye on our website and social media!
Hope that helps! 🙂