Xam idea is a unique way of revision. Every Chapter is summarised in the form of a low-chart. Important questions covering every aspect of the Chapter have been divided into different sections: Very Short Answer Questions, Short Answer Questions, Long Answer Questions, and Higher Order Thinking Skills (HOTS) Questions. This covers the Summative Assessment portion of the curriculum. The Formative Assessment portion has also been included followed by a self-assessment test. The second part of the series contains Model Question Papers for practice for the examinations.