disiblitytests of 2-20 ?
Here are few links for the answer to your query:
https://www.meritnation.com/ask-answer/question/divisibility-test-of-11/divisibility/6289774
https://www.meritnation.com/discuss/question/4707999/1/
https://www.meritnation.com/ask-answer/question/divisibility-test-of-11/divisibility/6289774
https://www.meritnation.com/discuss/question/4707999/1/