In order to maintain the security and integrity of our examinations Cambridge operates a system of entry codes based on location. In practice, this means that the component number given in the syllabus will not always match up with the component code on past papers on the Teacher Support website. When the component code has two digits, the first digit is the component number given in the syllabus, and the second number is the location code. Papers 11, 12 and 13 are, therefore, all Paper 1. When choosing a set of papers to use as a mock, always choose components with the same final number e.g. 12, 32, 62 or 11, 31, 61. The content of these exams is not specific to location, so they can all be used for practice examinations.