Two Themes for OTBA issued by CBSE for March 2017 Exam. Each Theme / Unit includes CBSE Sample Questions and a suggestive Marking Scheme. Latest CBSE guidelines for OTBA are included. CBSE FAQÂ’s about OTBA to provide concept clarity. Detailed Answers are given for CBSE Sample Questions. Extra Practice Questions and Answers for each Theme are developed by Oswaal ExpertsÂ’ Panel.