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By revising each date 4 or 5 times means if you repeat each date 4 or 5 times then it will be completely memorise in your brain and will hepful in our exams

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First Note Down All Important Dates In A Page Or NoteBooke
Second Try To Remember it once
Third Go through it just once in a day and do this till one month or u are sure about it and till exams u will be knowing all the dates