Hint:Pay attention to the stroke direction and order when writing the anusvara.
First write the vowel अ, then the dot (bindu) below the horizontal bar.
First write the dot (bindu) above the horizontal bar, then the vowel अ.
First write the vowel अ, then add the dot (bindu) above the top horizontal bar.
First write the dot (bindu) below the horizontal bar, then the vowel अ.
Explanation
The anusvara (ं) is a nasal diacritic written as a small dot above the headline. In अं, write अ first, then add the dot (bindu) above the top horizontal bar.