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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
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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.