The sections of Ambulance Technician Study are split as follows - Systems, Problems associated with the systems and Examination and Management.
I've also listed a link to a Cardiac section. This does not form part of the technician syllabus but I believe a few ambulance services conduct their own in house training on this subject.
Try some of the quizzes I've put together and see how well you retain information
More concise information can be gained from a number of publications on the market. If you want UK specific information then a copy of the JRCALC Clinical Practice Guidelines will have all the information you will require.