Dear friend, 'in between' is the same as 'between' as a preposition in the sense of 'in the time, space, or interval that separates' : between the ages 12 and 20 = in between the ages 12 and 20. You'd better put a period at the end of your sentence and capitalise only the initial letter in the word 'Amroha'. Also, please know that neither 'grammer' nor 'cheak' have anything to do with grammar check.
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