New Delhi, May 8 -- Everyone needs to unwind once in a while and that's exactly what Karishma Arora from Muzaffarnagar, one of the joint toppers of CBSE Class 12 examination did while preparing for her boards. She visited Delhi every week to de-stress herself by taking Kathak classes. Karishma along with Hansika Shukla from Ghaziabad topped the CBSE Class 12 examination this year, with a score of 499 out of 500 marks....