Careers teachers knowledge of and interest in UCAT Preparation varies quite markedly. There are those who go to the trouble of inviting UCAT MedEntry to come and deliver a course in-house at their school. At the other extreme, there are those who do not have time to research UCAT Preparation, and may be critical of its value for various reasons.
If you are in a school where the careers teacher is helpful with regard to UCAT Preparation, you are fortunate: your careers teacher will ensure you get all the necessary information about the UCAT and UCAT training. If your school has a careers teacher who is not, you must do most of the work. Talk to senior students, current medical students, google UCAT prep etc and start early. Network during UCAT Prep workshops and develop contacts so that you know what you need to do during various times of the year regarding UCAT preparation, the application process and medical interviews.