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Generally a crowded classroom is not conducive for individual teaching. The teacher and every student interaction are not possible in the class due to insufficient time. A teacher normally tries to avoid dull students. Besides some of the topics are not covered in the class. Private tuition becomes necessary where the student would not be capable of sitting at his studies by himself because he has no inclination towards his study or the parents have no time to look at their child's academicfatcat:zstfuu5bavflzogtpfbm5ni6si