Write the next sentence in the following story.

How to increase concentration level
Take a book and count words in any page of it.
You can also count it again after you done it to be sure you counted right.
Count from 100 to 1.
Count from 100 to 1 skipping each 3 numbers like 100 , 97 , 94 , 91 etc. Choose a word or sound and repeat it silently in your mind for 5 minutes.