1.to check the paper quality 2.to check the paper color 3.to check the paper thickness 4.to check the A4 sheet empty or not(Written or Not) 5.to check the size of the paper 6.to check weather it is folded or not 7.to check weather it is accept to write via pen or pencil 8.to check the company of the A4 Sheet 9.Check both sides are empty 10.Check it is not in wet condition 11.Check it is very neat