In Written ability test or WAT, you have to be at your best in writing on some assigned topic. MBA aspirants who wish to be selected in IIMs will be tested on WAT before interview and they might find the test tricky.
Positive approach to conclude on assigned topic will lead to motivate audience of your WAT to read with curiosity and if take away message is having clarity then you will be judged as good writer. That is the Creativity!
Writing simple and meaningful sentences focusing on topic will hold readers to your fold. WAT is not a test on your English writing but a test on your expression of thoughts!