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Extended essays are marked by external assessors (examiners appointed by the IB) on a scale of 0 to 36. There are "general" and "subject-specific" criteria, at a ratio of 2:1 (24 possible marks for the general criteria and 12 marks for the subject-specific one). The total mark is converted into a grade from A to E. A similar system is used for theory of knowledge and students can gain up to 3 points for the diploma based on the grades achieved for EE and TOK. A student who scores an E on either the extended essay or TOK essay will be automatically failed and no longer eligible to receive the IB Diploma (EE Subject Guide p15).